Medical studies agree that steroid use reduces life expectancy, it's one of the core reasons why they're highly regulated. Not only does it reduce life expectancy, but time spent healthy is reduced as well, meaning that not only might you die a number of years earlier, you'll run into age related illnesses a number of years earlier as well.

Studies don't show that for mild oral steroid use after 30, I also gave reasons I suspect it would be net beneficial for health.

Men have lower testosterone levels than their grandfathers, there are many possible causes but the treatment I'm talking about only really brings you to a bit above where grandpa would've been.

>I don't see why athletes over say 30 can't do some mild oral steroids

Because you've never met an athlete, I guess. None of them would stop at "mild".

Then why would they stop at none?

Because we can try to test for the difference between "mild" and "none", and the risk of disqualification does motivate many athletes to stop at none.

I would dose based on testosterone levels, if they took steroids out of program that would show in the blood work and the dose adjusted to zero, after that you test for the now prohibited steroid use.

The goal isn't to get them to a superhuman level, just to level the best genetics produce.