Jordan was productive at that age, and he gets shit on for that comeback as he was nowhere near what he once was.Kareem was still productive, but nowhere near what he once was.Duncan was still very good at 38(big decline at 39 though), but again he wasn't near what he was at his peak and wasn't carrying near the same load.Bron will probably still be a good player, but he's not going to be doing anywhere near this level at 38-39. It just doesn't happen.