Haha, you're basically disagreeing with me, then re-stating what I already said. Moxie, please refer to my specific use of "too old." My original sentence was: "He's probably too old to be projected as a future star, but the guy can play and could rise into seeding territory at the least." We're saying the same thing; the only difference is that you don't like my phrasing of "too old," probably because you're ignoring the rest of the sentence. But again, read the specifics: I think it probable that he's too old to become a star (i.e. regular top 10 at least). I'm not even negating the possibility that he's the new Stan, I just think it unlikely and saying that rising to seeding would be impressive in and of itself.
As for Wawrinka, at the same age he had already been in the top 100 for a few years, and finished age 23 (2008) at #13. In other words, he had flashed upside and was considered a bit of an underachiever at that point. Spizzirri just popped into the top 100 for the first time at age 24. I haven't done an intensive study, but I'd guess that the number of players who didn't make the top 100 until 24 and went on to make the top 10 can be counted on one hand, and could be with none.
But again, if Spizzirri gets to seeding (top 30), that's a nice story in and of itself.