Isn't medicine the same, only on a smaller scale? We already allow many people to live much longer than they would have lived "naturally". Would it be better t

Isn't medicine the same, only on a smaller scale? We already allow many people to live much longer than they would have lived "naturally". Would it be better to have dozen kids and watch half of them die before their first birthday? If no, then what is so great about watching your parents die before their hundredth birthday?