To the youngest age of 15, I would advice to wait out the time because the uterus is not yet strong enough to hold a fetus. It might affect the health of the fetus. To the middle ages like 20 and 30, I would most likely give the go signal because this is the proper and normal age. To the age of 40, I would advice to take advantage of the fertility because if she still gets older, it would be in the menopausal age. To age 45, I would not advice it anymore because the child may be either a genius or with mental illness.