ike Methuselah, supposedly living for almost a thousand years.dtm:
These very chaste people, did not have sons unul they were 80, 120 years old! but now, as mentioned in the OP, ---, with 20-30 years "overlap" , and condoms handed out in some primary schools---. anyway,
wt magazine is ~140 year old, In my family. people living to nearly 100, a 30 year overlap each to make a 2 group wt generation.
If groups dont overlap (or use contraceptives) they dont generate the next generation.
I think David & co was pulling our legs. still does.