The testing is also not the same. The pee in the cup is ensured in elite national top finishers. It is not in masters.
It should be rather obvious I as a 50+ (near 60) guy can get ED help, Insulin help - a bunch of help my 21 year old would find a bit more difficult to get.
It is easier and few care - esp at the national level for a master.
This is not a comment on relative ethics, or morals, rather - it is easier, and less tested.
Do you dispute that?