The mature sperm travel through a tube called the vas deferens through the seminal vesicle, a sac near the bladder. In the seminal vesicle, semen is added. Contrary to women, who produce an egg a month, men are capable of producing billions of sperm. A healthy man can produce about 1000 sperm per minute in the seminiferous tubules. Even though the numbers can decrease after the age of forty, men are capable of producing sperm from puberty well into life.
Men can be fathers in their eighties and nineties.
Cary Grant and Charlie Chaplin are good examples of that. Men are born with immature sperm cells called spermatogonia. At puberty, the pituitary gland produces the exact same two hormones, FSH and LH, that it produces in women. However, the effect in men is very different. One causes the testes to produce the male hormone testosterone, which is required for sperm to mature and for the sex organs to become fully operational.