This fact should be taught in Middle School, High School, College, All Doctors Should Know this and Advise Their Patients

"Men's reproductive health is most robust in their twenties, and after that it's downhill. Each year after puberty, a man's spermmaking cells divide about 23 times. By age 40, these vital human building blocks have gone through about 610 rounds of replication, each with a chance for genetic error."