We should allow doping in athletics. If the athletes are OK with it, and the public wants to see bigger and better performances, why not?
Why create arbitrary barriers and lines? You can take vitamins, creatine, and other chemicals to make yourself better than you normally would be. But, you may not use your own blood. You can take this chemical, but not that one.
Stupid. Just allow it all. If an athlete is OK with only living until he's 40 years old, then let him take all that stuff. I'd probably watch some guy who is able to ride a bike at 100mph up a mountain. Sure be more exciting than watching the same guy huffing and puffing to do 40.