Sperm does change but not much. Not as much. Sperm is always being created so its fresh new cells all the time.
Keeping testosterone up can prevent a lot of problems as you age.
I am finding treadmill 5 times every week is keeping me out of doctor’s offices in my early 80’s. Heart runs smooth and quiet, don’t even breathe heavy climbing 2 flights of stairs.
I do not take any supplements except 1 a day vitamin pills.
It can also cause a bunch a problems as the growth hormone can cause the wrongs stuff to grow like cancer cells.