Glen wrote

> I offered 80,000 BCE because I don't think that the world's
> languages are terribly different from each to other to make it
> earlier than this. Plus, I recall there being a near extinction of
> humans and a certain supervolcano in Sumatra that went kablooey at
> that time.

I wonder about Khoisanid languages perhaps being earlier than this
Glen. What's your view?