Age also has an impact on male infertility, though the result is not as severe as it is in women. As men age, the number of sperm, the motility of sperm and the percent of normal sperm all decrease slightly. Pregnancy and birth rates decline and miscarriage rates increase when the male partner is older than age 50 (fig. 9). Despite the fact that some men can become fathers up to age 80 or older, couples should consider the effects of aging on both partners when making parenting plans and decisions.