Steroids being illegal doesn't seem to be the biggest deterrent in the world. Also, I agree that eventually you can't stop the aging but my point is how they can extend it.
Take the hit record for instance, at a 20 year career we all know its 200 hits a year for 20 years. Add just 5 more to that career and its all the way down to 160.
Still an impressive feat no doubt but the point is how reasonable it is to see them being able to add 5 years to the career of a guy who took good care of himself and the effect on the career accumulation records when/if that happens?
Very plausible imo.