I know people still huuge into collecting Pokemon who're in their late 20s, early 30s so it's never too late. XD
Pokemon-wise I only collect figures and plush unless there's something really cute that catches my eye (stamps, cards, coins, etc). As for other collections, there's not much. I'll collect stuff from other fandoms like books, figurines, DVDs, games, etc. but I don't spend too much on them. Pokemon's my main love. 8) Do you collect anything? :O