"Forever young" like the song could be a better desire... or "18 till I die"...
There's a lot of concepts mixed: invulnerability, immortality, longevity, lack of aging, etc.
by the way each day. aprox. there are 250000 births in the world and 150000 deaths. If you think the population is growing... just imagine deleting the deaths... that probably will cause people to have more children... even...