Neanderthals came first by an enormous margin on any scientific timeline. The earliest members of the Neanderthal lineage appear in the fossil record roughly 400,000 to 600,000 years ago, while the biblical Adam and Eve are placed somewhere between 4000 and 5500 BC depending on which ancient manuscript you use. That puts Neanderthals hundreds of thousands of years earlier. But this question sits at the intersection of two very different ways of understanding human origins, and the answer depends on which framework you’re working with.
When Neanderthals Lived
Neanderthals occupied Europe and parts of western Asia from about 400,000 years ago until roughly 40,000 years ago, when all traces of them vanish from the fossil record. The Smithsonian’s Human Origins Program places their full range at 400,000 to 40,000 years before present. The first Neanderthal fossils ever discovered were actually found in 1829 in Belgium and 1848 in Gibraltar, though nobody recognized what they were at the time.
Their roots go even deeper. Fossils from the Sima de los Huesos cave site in Spain, considered the very beginning of the Neanderthal evolutionary lineage, have been dated to around 530,000 to 600,000 years ago. These proto-Neanderthals were already developing the distinctive skull and body features that would define the species.
When Adam and Eve Were Placed in History
The most famous biblical timeline comes from Archbishop James Ussher, a 17th-century scholar who traced the genealogies in Genesis to calculate the age of the world. By adding up the lifespans listed in scripture (Adam lived 930 years, was 130 when he fathered Seth, and so on through Noah, Abraham, and onward), Ussher’s chronology arrives at roughly 4,000 BC for creation. The full calculation from Adam to Christ totals 3,974 years, six months, and ten days.
That date isn’t fixed across all traditions, though. The Hebrew Masoretic Text, which Ussher relied on, places Adam’s creation around 4065 BC. The Greek Septuagint, an older translation used by many early Christians, puts it at roughly 5451 BC. The difference comes from the ages assigned to the patriarchs: the Septuagint says Adam was 230 when Seth was born, while the Masoretic Text says 130. Those gaps compound across generations, producing a difference of nearly 1,400 years. Even at the oldest estimate, though, the biblical timeline places Adam and Eve no earlier than about 5500 BC, or roughly 7,500 years ago.
The Scientific Timeline for Modern Humans
Anatomically modern humans, Homo sapiens, appear in the African fossil record around 200,000 years ago. The oldest well-dated skeleton sharing our species’ physical features is the Omo Kibish 1 specimen from Ethiopia, now firmly placed at approximately 195,000 years old. This means our species was already living in Africa for well over 150,000 years before Neanderthals went extinct in Europe.
Genetics tells a parallel story. The most recent common ancestor of all living men’s Y chromosomes (sometimes called “Y-chromosomal Adam”) lived between 120,000 and 156,000 years ago. The most recent common ancestor of all living women’s mitochondrial DNA (“Mitochondrial Eve”) lived between 99,000 and 148,000 years ago. These are not a literal couple. They’re statistical reference points, the most recent individuals from whom all living humans inherited these particular genetic lineages. They almost certainly never met, and thousands of other humans were alive at the same time.
Neanderthals and Modern Humans Overlapped
Neanderthals didn’t simply disappear before modern humans arrived. The two species coexisted for tens of thousands of years and interbred. Genetic studies estimate the last significant gene flow between Neanderthals and the ancestors of present-day Europeans occurred roughly 47,000 to 65,000 years ago, though some estimates stretch the window from 37,000 to 86,000 years ago.
The proof is in living people today. Non-African populations carry Neanderthal genetic variants that African populations largely do not, a direct signature of interbreeding that occurred after some human groups migrated out of Africa and encountered Neanderthals in Europe and western Asia. This genetic overlap is one of the most concrete pieces of evidence that both species were alive, interacting, and reproducing together during the same period.
Can These Timelines Be Reconciled?
For those who read Genesis as a literal historical account with specific dates, Neanderthals present a challenge. They predate the biblical creation by hundreds of thousands of years. Some young-earth creationists address this by questioning radiometric dating methods or by classifying Neanderthals as descendants of Adam who lived after the biblical flood. Others view them as a separate creation not mentioned in scripture.
Many religious traditions, including mainstream Catholic and many Protestant denominations, do not read Genesis as a scientific chronology. For these believers, the creation account communicates theological truths about humanity’s relationship with God rather than calendar dates. Under this reading, there’s no conflict: Neanderthals existed on the evolutionary timeline, and the Adam and Eve story addresses a different kind of question entirely.
A more recent attempt at bridge-building comes from computational biologist S. Joshua Swamidass at Washington University in St. Louis, who proposed what he calls the “Genealogical Adam and Eve” hypothesis. His model accepts the full evolutionary timeline, including the emergence of humans as a population sharing ancestors with other animals, but argues it remains mathematically possible for a specially created couple to have existed alongside that population and eventually become universal ancestors of all living humans. The model doesn’t require rejecting evolutionary science, but it does reframe what “ancestors of everyone” means in genealogical rather than genetic terms.
The core tension is straightforward. Science places Neanderthals in a timeline stretching back 400,000 or more years. Biblical chronology, taken at face value, places all of creation within the last 6,000 to 7,500 years. How a person navigates that gap depends entirely on how they understand the purpose and genre of the Genesis text.