For the sake of keeping pollution down, I finally have to say something:
1. There are people who were able to play Rach3 at age 13 (whatever "play" might mean in this context). Get over it!
2. What effect does it have when people claim that they can do this or that on forums such as this one? None, whatsoever. These discussions will not help any reader overcome any obstacles they might be having with their pieces at the moment, or make the world a better place. The only positive effect I can see that such a claim might provide is some kind of questionable motivation ("What, you can play Rach3 at age 13?? I'm gonna show you, I'll play the OC at age 15, and I'm gonna memorize it in two days!!).
So, instead of wasting your breath, the Internet's bandwidth and everybody else's time (because we have to make an effort to ignore this childish stuff), go out and help each other become better pianists by offering solutions to problems.
By the way: when I was ten, I could stand on my head, recite Homer's Odyssey, in Greek, play two games of chess, blindfolded, juggle four balls (quite difficult when standing on one's head), and whistle Mahler's First Symphony backwards, all at the same time!
What, you call me a big fat liar? You suck!