If I have my babies young, will my health be better or worse later?

Too many factors. There is no "one size fits all" answer to that question. P{regnancies in the very young (before 18) and the later in life (after 32) are frought with many health issues that may adversely affect the infant and the mother.
Babies. Your risk of pregnancy complications increases with age. That can have an impact on your health. So having babies at a younger age is less risky.