But that doesn't mean that all, or many, or most of today's attested languages couldn't descend perhaps from one that's much younger than that, like say 20,000 years, or something of that kind. It's what we call a bottleneck.
Dar asta nu înseamnǎ ca toate, sau multe, sau majoritatea limbilor cunoscute azi nu ar putea proveni dintr-una care e mai recentǎ, sǎ zicem de acum 20.000 de ani, sau ceva asemǎnǎtor. E ceea ce numim o gâtuire.