Lost worlds TV show

Watching lost worlds and they're exploring  pagan construction in Scotland circa 3000 bc. The tombs  had no skeletons over 25 years of age. Assuming a child bearing age of maybe 14 years, you'd be dead long before your grandchildren would be born. What a strange world that must've been.

Wow. That’s a population barely continuing.

I love telling my 6th graders, “You know, in many periods of history, at age 11, you’d be late having a spouse, home, doing your lifelong work, garden, …etc. It’s really time to stop being a child.”