Quote Originally Posted by Mr.B View Post
If they moved most of the silver age and bronze age (compression) into the early and mid 80s, it would probably shave off decades of aging.

Another way is just have Earth 0 people not all aging the same way, bit more fantasty world.
It needs to be the 90s and 2000s, to be honest. Don't forget 1980 was already 40 years ago, which would mean any adult hero who debuted in 1980 would be at least 60 (even the New Teen Titans, who did debut that year, would be in their late 50s).