On the age thing. IIRC M2K was around 12 or 13 when he first got into competitive Smash and is now considered one of the best players in the world. There's also a play in my region known as MegaFox who I believe is around the age of 15 and is one of our best Brawl/Smash 4 players. There's also a Project M player in Dallas called Lunchables who is considered one of the best players in his region. Starting at a younger age is generally better, I think, as it allows you to learn more at a faster rate. Most of the people you'll meet for competitive Smash IRL will be mostly nice and willing to help you get better and not care about your age.
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Also. I get the chance to play Smash 4 U today for the first time, thankfully will be getting the game tomorrow. But I was having a hard time finding a character(s) I liked playing, I also don't like playing characters I main/sub in other games (64 is Fox, Melee is Sheik, Brawl is Olimar main Marth sub, and Project M is Toon Link main Mario sub) so they're out of the equation. I seem to have a tendency to favor character with, at the very least, decent mobility, a projectile or disjoint of some kind, or both even, and I seem to have a preference for shorter characters but it isn; a huge deal on this last thing. However most characters I try there is something I dislike that makes me go ehhhhhhhh, maybe not. Like Robin fits the bill for disjoint and projectiles but sheesh that mobility. Or Palutena, which is a character who I want to like and at first glance she seems to fit the bill decently well but there is something making me go eh maybe not. Or Villager, who is another character I want to like as I love his Specials and Fair/Bair but I find his other moves awkward as hell to use. Diddy and Pikachu also seem as if they fit the bill but something about them also makes go eh maybe not. I just seem to be having one hell of a time finding, at least, a few character I want to play around with on the quest to find a main and sub.