A woman is most fertile in her mid-twenties. Her fertility declines until she reaches 30 and then drops rapidly. For men, fertility decreases slowly until around 40 years of age and then begins to decrease more rapidly. The most common reasons for male infertility include azoospermia (no sperm cells are produced) and oligospermia (few sperm cells are produced). The most common female infertility factor is an ovulation disorder.

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