From Newsgroup: sci.misc
Older Men's Sperm Carry More Mutations, And They May Turn Harmful...
...
Around 2 percent of sperm from men in their 30s were found to be
carrying disease-causing mutations, which jumped up to 3-5 percent for middle-aged and older men (over the age of 43). By age 70, an average
of 4.5 percent of sperm had potentially harmful mutations.
https://www.sciencealert.com/older-mens-sperm-carry-more-mutations-and-they-may-turn-harmful
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