From: here@is.invalid   
      
   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-mutatio   
   s-and-they-may-turn-harmful   
      
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