Not sure how many 50+'rs care about sperm production, but here is an article listing activities that may decrease sperm production, including wearing bicycle shorts.
"However, wearing tight bicycle shorts for an extended period of time is a bad idea as well, Dr. Wharton adds. The more constricted a man's pants are, the less hospitable an environment he creates for sperm production."
and cell phones, and laptops, also!!
Do you agree?