Half a million years of Homo sapiens
March 19, 2026
If you look through the revision history of the Wikipedia page for Human, you'll notice something interesting.
As of the latest revision, it says, "Anatomically modern humans emerged at least 300,000 years ago in Africa".
As of December 31, 2017: "Several of these hominins... gave rise to anatomically modern Homo sapiens in Africa about 200,000 years ago".
As of January 28, 2007: "Homo sapiens originated in the African savanna between 100,000 and 250,000 years ago".
As of May 8, 2006: "Homo sapiens originated in the African savanna between 100 and 200 thousand years ago".
Wikipedia is, of course, not always correct, and it likely lags the scientific consensus on many topics by months or years at best. Nevertheless, the Wikipedia trend reflects the fact that our best estimate of the age of Homo sapiens is growing with time. On one hand, this is unsurprising. As soon as you have one secure dating of any phenomenon in the archeological or fossil record, its estimated age over time either grows or stays the same. On the other hand, this goes against our intuitions about how the story of deep history is pieced together. You would probably find it strange if, for example, the estimated age of ancient Egypt had doubled within your lifetime.
In order to better understand where we come from, let's jump into the rough story of human history as it's currently understood. Before we get into the weeds, though, one clarification is needed. Because some disagreement exists on the use of the terms hominin and hominid across different fields of science, here's how I use them:
Hominin: members of the genus Homo. This includes Homo sapiens and our close relatives like Homo neanderthalensis.
Hominid: members of the family Hominidae, also called apes. This includes all members of the genus Homo, as well as chimpanzees, gorillas, orangutans, and all other species, extinct or not, that descended from their common ancestor.
With that out of the way, the story of human history starts about 7 million years ago with Sahelanthropus tchadensis, the earliest hominid commonly believed to be bipedal. It's considered the possible common ancestor of humans and chimpanzees, or perhaps a close relative of that common ancestor, though this is debated. Regardless, fewer than ten specimens of Sahelanthropus tchadensis have been recovered, all within one square kilometer of each other in northern Chad. Consequently, very little is known about it, and it's probably safe to assume that if it was truly bipedal, then there were other bipedal hominids around at that time as well.
Fast forward about three million years and we see the emergence of the genus Australopithecus, the first hominids known to make stone tools[1]. Australopithecus is thought to be the ancestral genus of Homo, though there are other known bipedal hominins that co-existed with Australopithecus, such as Kenyanthropus, which may also have played a part in our evolution. Early members of the genus Homo include rudolfensis, appearing 2.5 million years ago; habilis, 2.3 million years ago; and erectus, about 2 million years ago. There's no definitive evidence of direct ancestral progression between these species, and as I discussed at length in Defining Homo sapiens, the lines between hominins are often very blurry. One reason for this blurriness is that direct genetic evidence only reaches so far: at around 430 thousand years old, the Sima de los Huesos hominin fossils, discovered in the 1980s and believed to be a precursor of Neanderthals, represent the oldest specimens from which anyone has successfully sequenced DNA. This is obviously much younger than Homo erectus and many other super-archaic hominins, so researchers rely heavily on anatomy to classify hominin fossils and their relation to one another.
Homo erectus is thought to be the first hominin that left Africa, commonly cited at 1.8 million years ago, though there are multiple lines of direct evidence that hominins did indeed leave Africa before, at least 2.5 million years ago. Many related hominins such as Homo ergaster, Homo antecessor, and Homo heidelbergensis have been classified over time as either independent species or as transitional forms that represent subspecies of Homo erectus over its roughly 2-million-year history. Homo erectus, possibly first evolving into Homo heidelbergensis or Homo antecessor, split into isolated populations in Asia, Europe, and Africa, subsequently evolving into Denisovans, Neanderthals, and Homo sapiens, respectively, on each continent. All three of these groups interbred to some degree but remained distinct for hundreds of thousands of years. Homo sapiens left Africa in at least two big waves, and Neanderthal genetics are thought to have found their way back into Africa in at least one wave, either directly via Neanderthals or indirectly via groups of Homo sapiens they had previously mingled with. Meanwhile Homo erectus in Southeast Asia stayed relatively isolated from the other hominins, perhaps evolving into Homo floresiensis in parts of present-day Indonesia and Homo luzonensis in the present-day Philippines, before eventually dying out. The last Homo sapiens wave out of Africa ended around 50 thousand years ago, when Homo sapiens populations began exhibiting widespread cultural complexity marked by better weapons, more trade, and a higher level of symbolic activity like cave art and carved figurines. A number of other hominin populations began to die out at roughly this time, and direct competition with Homo sapiens may be partially responsible for their demise, though much remains uncertain.
Okay, so that's the rough story. And just to emphasize — it's really rough. Don't worry if it was hard to follow, because the details change constantly with new archeological finds, DNA and protein analyses, and radiometric datings. Below I've included various figures from the last 30 years mapping out the proposed evolutionary history of Homo sapiens, just to reinforce the idea that the story is constantly in flux. We should assume that even the most detailed evolutionary history below is missing the vast majority of the story, evidence of which has either been completely lost to time or is yet to be discovered[2].
Despite all the uncertainty, genetic data gives us a high level of certainty about some aspects of our history. For example, mitochondrial DNA analysis makes it clear that all living humans share a common matrilineal female ancestor around 150-200 thousand years ago — the common ancestor, that is, of every living person's mother's mother's mother, and so on. This doesn't mean that she was the only woman alive at that time, rather that she is the only woman from that time with an unbroken line of female descendants between her and every living person. Similarly, Y-chromosomal analysis shows that all living humans share a common patrilineal male ancestor between 200 and 300 thousand years ago. And, though some are debated, there's also genetic evidence for a number of other genetic bottlenecks throughout human history which could be related to infectious diseases, climate change, migration trends, or cultural evolution, like the widespread adoption of agriculture.
While this data gives us some important information about our very distant ancestors, it doesn't tell us conclusively whether or not they were anatomically modern humans (Homo sapiens). For that, we rely on skeletal remains. Over the last hundred years, numerous fossil discoveries have influenced the estimated timeline of human history. In many cases, the estimated age of these findings has grown with time. Here are four key examples:
The Skhul and Qafzeh remains, discovered in present-day Israel between 1931 and 1935: These Homo sapiens fossils were commonly thought to be Neanderthal descendants and were initially estimated to be 40-50 thousand years old based on their biostratigraphy and the types of tools found alongside them. Thermoluminescence (TL) dating, electron spin resonance (ESR) dating, and Uranium radiometric (U-series) dating from the late 1980s onward pushed their estimated age well beyond 80 thousand years, and a 2005 U-series study found that some of the remains are up to 130 thousand years old. Today the Skhul and Qafzeh hominins are considered Homo sapiens who were part of an early migration wave out of Africa and who predate many of the Neanderthal remains found in the region.
The Florisbad Skull, discovered in South Africa in 1932: This skull was initially considered a new species, called Homo helmei, and it was suggested that it originated in the Middle Pleistocene, sometime >130 thousand years ago, although this was debated. Later radiocarbon datings from the 1950s-1970s dated it either beyond the upper limit of radiocarbon dating[3] or around 40 thousand years old. In 1996, it was dated with ESR to 259 ± 35 thousand years old. From the 90s onwards, consensus shifted towards the conclusion that the Florisbad Skull is indeed an early Homo sapiens fossil.
The Omo fossils, discovered in Ethiopia in 1967: These remains were initially estimated to be at least 130 thousand years old, significantly older than any other recognized Homo sapiens fossils at the time. In 2005, a radiometric argon dating pushed their estimated age up to 195 ± 5 thousand years, and, in 2022, another argon dating pushed their age to 233 ± 22 thousand years.
The Jebel Irhoud fossils, discovered in Morocco in 1961: Initially believed to be Neanderthals and estimated to be around 40 thousand years old, biostratigraphic evidence later pushed the consensus view well beyond 100 thousand years. New excavations starting in 2004 led to the reclassification of the fossils as Homo sapiens with some archaic features. In 2017, flint artifacts were dated with TL to 315 ± 34 thousand years ago, and a mandible was dated to 286 ± 32 thousand years ago. Jebel Irhoud is now considered the oldest known Homo sapiens remains.
There are two primary reasons for this trend towards an older origin of our species. The first is that, while there was no consensus view in the early 20th century on the birthplace of Homo sapiens, there was a prominent Eurocentric view that Homo sapiens evolved primarily from Neanderthals. Most Neanderthal findings at the time were estimated to be somewhere between 40 and 100 thousand years old. This created a perceived upper bound on the age of Homo sapiens fossils, and hominin fossils presumed to be older, such as the Florisbad Skull, were categorized as different species. The second and more obvious reason is technological progress in dating organic remains. In the 1930s, radiometric dating for organic materials didn't exist, and although radiocarbon dating was developed in the 1940s, it doesn't provide reliable dates beyond 40-50 thousand years. Since then, geochronological dating methods, including TL, ESR, and U-series dating, have improved immensely, so I don't expect that further improvements will significantly shift the estimated ages of the aforementioned fossils. But, as I discussed in Ancient history's blind spot, as you go further back in time, estimates tend to become minimum bounds. Said another way, we are not sure exactly how old Homo sapiens are, but we're highly confident they're at least 315 thousand years old.
And, in recent years, the cadence of new archeological findings challenging the status quo has not slowed down. If anything, it's speeding up. Many new hominin species have been discovered just in the last 20 years, including Denisovans, Homo naledi, Nesher Ramla Homo, and Homo luzonensis. In 2013, there was also a 2.8-million-year-old mandible discovered in Ethiopia, called LD 350-1, believed to be from an unknown species of Homo. It pushed back the minimum age of the genus from 2.4 to 2.8 million years.
Also in recent years, multiple lines of genetic evidence seem to indicate that Homo sapiens, Neanderthals, and Denisovans split from their common ancestor sometime between 500 and 800 thousand years ago (see Figure 1). If we ever recover hominin fossils older than those at Jebel Irhoud that are presumed to be a part of our lineage, perhaps their anatomy will be midway between anatomically modern Homo sapiens and Homo heidelbergensis or Homo antecessor. If so, the fossils would likely be classified as a new species, a precursor to Homo sapiens as the Sima de los Huesos hominins are to Neanderthals. A new study, published in January by the same team responsible for the latest Jebel Irhoud excavations, claims to have identified additional hominin fossils in Morocco that could be exactly that missing link. The fossils, discovered at Grotte à Hominidés (English: "Hominid Cave"), are dated to 773 thousand years ago, and the study's authors suggest the fossils are the best candidate for a precursor to Homo sapiens sometime after they diverged from their common ancestor with Neanderthals and Denisovans.
But, because we lack DNA evidence from these fossils, a lot remains uncertain. Just as many early researchers mistakenly believed that Homo sapiens descended from Neanderthals, we may be mistaken again about the hominins we believe we descended from, whether Homo heidelbergensis, Homo antecessor, or the hominins from Grotte à Hominidés. The truth may be that we simply coexisted with these hominins — which is what a recent study of a deformed, 1-million-year-old skull from central China seems to suggest. The study, published in September 2025, digitally reconstructed the skull and identified it as a Denisovan[4]. The authors further suggest that the split from the last common ancestor of Homo sapiens, Neanderthals, and Denisovans actually occurred between 1.3 and 1.4 million years ago. If true, this would roughly double the current consensus. It's also hundreds of thousands of years before Homo heidelbergensis and Homo antecessor are thought to have first appeared. Of course, these findings are recent, and time will tell if the study's conclusions are broadly accepted.
Regardless, as we see in the Jebel Irhoud fossils, consensus is built on what is observed, not what is expected. The safest assumption is that Homo sapiens are only as old as the oldest known find. But a reasonable assumption is that we are older. As a rule of thumb, I expect that Homo sapiens are about half a million years old. If we eventually find fossil evidence to prove it, we should consider it interesting, but not that surprising.
As a closing thought, consider that, in 1997, when the Schöningen spears were dated to 400 thousand years, the discovery revolutionized our understanding of archaic hominins' weapon-building capabilities. It's presumed that these spears were built by an ancestral or cousin lineage of Homo sapiens. The same is true of the world's oldest known woodwork, the Kalambo structure, discovered in 2023 and dated to 476 thousand years old. Given the variety of hominins roaming the earth at the time, more than likely these were not made by Homo sapiens. But the truth is we don't know. They could have been us. All we know for sure is that we've been around for at least 315 thousand years.
Notes:
Lots of hominids use stones as tools, but the Australopithecus tools were manufactured, having been sharpened or altered in other ways.
It is extremely likely that the closer this topic is studied, the more complicated it will grow. I expect that the real story is at least 100x more complex than the most detailed evolutionary history proposed to date, and I expect that there are dozens of additional extinct hominins we have not yet discovered.
See C-850.
It actually identifies the skull as Homo longi, one of the proposed species names for Denisovans.