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.
Men det betyr ikke at alle, eller mange, eller de fleste av dagens språk ikke kunne stamme fra et yngre enn det for omtrent 20,000 år, eller noe slikt. Det er det vi kaller en flaskehals.