Never mind 20 years ago, wait until your 90. It's like being born again.
Meaning that you're small, bald, wrinkled, helpless, shitting in your diaper, and totally unaware of what's going on in the world around you.
I think we should be born old and go backwards. Start life that way, get younger and healthier, peak at physical perfection when your mind is most ready, then spend your final days playing and watching cartoons, finally to end sucking on tits and, at last, crawling into a coochie to die.
