Don't the difficulties in pregnancy related to age tend to come up around 40 or older? I don't think the choices need to be "have children at 19 years old" or

Don't the difficulties in pregnancy related to age tend to come up around 40 or older? I don't think the choices need to be "have children at 19 years old" or "have children at 40" - surely having kids at 30-35 is still physically fine and gives you some time to become more financially secure?