The older a woman is, the more abnormal ova they will have compared to healthy ova. When a woman reaches her mid thirties her chances of a miscarriage will rise by 16 percent, and by 44-46 years of age a woman’s chances of losing their child will have risen by 60 percent.

Since your baby's most critical development has taken place by month 3, your chance of miscarriage drops considerably after three months.

Common problems with a woman's reproductive organs, like uterine fibroids, endometriosis, and pelvic inflammatory disease can worsen with age and also affect fertility. These conditions might cause the fallopian tubes to be blocked, so the egg can't travel through the tubes into the uterus.

An older woman's eggs aren't fertilized as easily as a younger woman's eggs — and might not develop normally even after fertilization occurs.

Use of injectable fertility drugs to induce ovulation can cause OHSS, in which your ovaries become swollen and painful.

Reduced production of FSH will affect the numbers of sperm produced.