i think that younger, smaller, SKILLED players, are enjoying more success, because of the rule changes (really, just enforcing the rules), reducing clutch and grab, interference, hacking, etc... maybe younger players are being relied on more, for financial reasons?
i heard that players start performing to the best of their abilities, around the 3rd year in the league. lots of variables involved when analysing, so it certainly is not objective. i believe that most players are at their peak, between 24-30.