What Statement Accurately Describes the Effect of Aging on the Male

What statement accurately describes the effect of aging on the male reproductive system?

A) Sharp demarcation of the beginning or end of sexual activity occurs at age 50.
B) Men stop producing sperm as their level of testosterone secretion declines with age.
C) Many men experience benign or malignant hypertrophy of the prostate gland.
D) Older men experience a shorter refractory period between orgasm and the ability to achieve another erection.