hmm....That's a good question and I found myself asking the same question about a year or so ago. (by the way, I'm 14) I know full-grown adults who still collect barbies, and will still spend $50 on a Holiday Barbie! As to play with them, I've kind of gotten away from it, (probably because they are at the house we're moving to and I've been So busy) but I would say, don't listen to other people! Most of them are stupid! How old are you? I would say you could go as long as you want, but I think people think 15 or 16 is the finishing line. Sorry the answer is so long! =) God Bless!