The First Human?.....When....

[MaxCathedral]

I have heard figures from 80,000 years to 5 million to 20 million years.......

The accepted figure seems to be one hundred thousand years ago, man first appeared...

If we accept that the Universe is 15 to 18 billion years old, the milky way 12 billion years old, mother earth at 4. 5 billion years old...

When do we first appear in the timeline?

[Sayonara³]

It depends what you mean by 'human'.

[Skye]

The 100,000 refers to our species, Homo sapiens. The older dates refer to lineages of hominid apes that led to Homo sapiens. This is a little rubbery, partly because the classification system is being modified to fit in with new genetic information.