You are more likely to get some messed up kids from a middle aged woman than a first cousin, its not actual incest like people want you to believe.
You don't have to marry your cousin, I would dislike to marry the ones I know, but its the mark of a westernized person if they can't accept people marrying their cousins that they didn't even meet!
Don't be stupid. The average Somali hooyo has her last child at around 40 - 42. We are from big families. Many kids who are the youngest are born whilst the mother is older, its normal.
Historically, women never had birth control so would
still have kids well into their late 30s and early 40s. So I don't know what your agenda is.
Btw, studies show that fathers above the age of 45+ are also much more likely to produce kids with issues compared to young men. Quality of sperm detoriates. With women though, the older they get the higher birth complications.
If you want to talk about older women being much more likely to have kids with issues then you also need to take into account that older fathers also have the same issues. The big difference is that men don't have a biological clock, but the quality definitely goes down.