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 betyder ikke at alle, eller mange af, eller de fleste af nutidens talte sprog ikke kan nedstamme fra en forfar meget yngre end det, eksempelvis 20.000 år, eller noget i den stil. Det er dét, vi kalder en flaskehals.