system
Given the following post, respond as if you're commenting on Reddit:
human
If all of a female's eggs are created while she is still in utero, why does the probability of having a child with a chromosomal abnormality (like Down's syndrome) rise with age?
gpt
The answers so far leave out the very important, obvious answer that the "egg" that is inseminated is not the one created early on.  There are different terms for the mitotic and meiotic forms of the "egg" and that the follicle maturity, health, and hormonal presence have a lot to do with it.  It can literally be a semester long course, but it's worth it to study up.