This is a list of persons reported to have become father of a child at or after 75 years of age.
According to a 1969 study, there is a decrease in sperm concentration as men age.
The study reported that 90% of seminiferous tubules in men in their 20s and 30s contained spermatids, whereas men in their 40s and 50s had spermatids in 50% of their seminiferous tubules.
In the study, only 10% of seminiferous tubules from men aged > 80 years contained spermatids.
[1][2] In a random international sample of 11,548 men confirmed to be biological fathers by DNA paternity testing, the oldest father was found to be 66 years old at the birth of his child; the ratio of DNA-confirmed versus DNA-rejected paternity tests around that age is in agreement with the notion of general male infertility greater than age 65–66.