While we may be living basically as children all the way up to our 30’s (the total life expectancy in the middle ages) our bodies are maturing earlier and earlier sexually. It is not uncommon for girls to start puberty as young as 8 or 9 now!
If these “kids” don't mentally mature until 28 or 29... that means they are expected to wait 20 YEARS to satisfy the urges they started to experience at 8 -9 !
That’s an interesting point about our bodies and puberty - but to counter that - people are living much longer now.