well, there are different issues of aging - Barry Harris is a much more profound pianist at 75 than he was at 30, though he was great even than. Max Roach, however, lost his way as he tried to emulate younger drummers; he became stiff and unswinging. Even Al Haig, in his 50s, , was not the player he was in his 20s; he at times spent too much effort trying to sound contemporary, and wandered from the style at which he was best. Similar issue with Art Pepper, who was great unless he was thinking about Coltrane. Coleman Hawkins grew as a tenor saxophonist (before his very last sad years). Dexter Gordon changed for the better, than got too stoned to care. Personally I think I have better taste at 50 than I had at 20, it's just hard getting the damned walker onto the stage -