Question: Why is it likely that when older people try to have babies that the baby will have a disibility of some sort or something is wrong with it?

Ed Morrison answered on 22 Jun 2011:

Doctors don’t understand exactly why this is, but evolution suggests an interesting theory. As females get older, they have fewer and fewer chances to have babies. If they are young and they fall pregnant, sometimes the body detects there is something wrong with the embryo, and it spontaneously aborts so the mother can try again for a healthy baby. But in older mothers, they may not get another chance to have children, so the body may allow embryos with some problems to develop anyway.

At the moment this is only a theory, so we don’y know if it’s true.