I think that's more to do with physical nature of the game. Football game last 90 mins every matches in very high intensity in top level, and the pitch often covers long distance, so technique and experience alone is not sufficient to sustain. For example if we look at Rooney, who's game is more rely on his physical edge (pace, strength, stamina etc), he no longer a top player at age 30-31, and no longer quite up to PL standard at age 33, and he retired at age 35. Even if we look at other top technical player, like Messi, his form drop a lot this season at age 33 too, and we have other skilful players like L.Ronaldo and Ronaldinho dropping drastically just when they are about to enter age 30. But there are some players like Sheringham who is still doing a fine job in England even at age 34-38 though, as his game never rely on pace, strength and stamina throughout his career, and its more on decision making etc, so he is one of very few exceptions. Of course, there is also Ibra.
So its fair to say normally once the player loss their pace, stamina and physical edge at around age 33, they performance regress and no longer meet the standard required at top level. And that applies to most of technical player as well.