So it takes 20 years for a sexed up WW2 vet to hop in the sack after returning from the war?

Fuck if I know, that's not what I'm speaking about.

You don't pop out of your mother's womb already programmed to have an understanding of the socieity that you live in. You learn as you go from external sources (parents, family, society) and you act a certain way at each milestone of your life (child, young teenager, older teenager, young adult, adult, middle aged, senior).

When we all judge someone by applying a generation label its done based on how they act/opine, and not the chronological date that they entered the World. There's a lag/delay from when a person starts to exist on this Earth to the time they form a personality and express said personality.