>>bondar+(OP)
Issues like these reflects an evolutionary blind spot: selective pressure drops off after reproductive age, allowing defects like prostate dysfunction to persist. It's the same reason late-onset neurological diseases remain prevalent.
>>jbd0+yj
The problem there is with your definition of grandfather. Currently, the age for a grandfather in developed countries is 55+. For most of humanity's history, if there were grandfathers, they would barely make it to 55 years of age.