As far as health is concerned, 24 to 30 is the best age to get pregnant because a woman is at the peak of fertility. Too early or too late carries risks of complications.
As age advances so do the risk of other problems that may affect fertility such as uterine fibroids, adenomyosis, and endometriosis.
The biggest risk an older woman faces, though, is difficulty conceiving because of the sharp decline of fertility at 35.
When a woman gets closer to menopause (which on average occurs between 45 and 53 years of age) the decline is much faster and that is genetically programmed so a woman doesn't make a baby when they've hit menopause.
Aging affects both men and women. The difference is for a woman, once she has reached the age of menopause, her chances of naturally having a baby end at that point. Men produce sperm throughout their lives. A man has a potential to make a baby as long as he is alive. The sperms are probably fewer and of poor quality but still there.
Risks of complications such as gestational diabetes, hypertension, spontaneous abortion (or miscarriage), premature delivery, low birth weight, stillbirth and chromosomal abnormalities increase with advanced maternal age.