I probably posted in this already but.... If you like it, enjoy it. If you enjoy it, isn't it like a part of you would be missing if you stopped doing something you loved? Its one thing if its your choice, but don't let anyone tell you to stop.
I've been told that for years and for the most part ignored them, they (for the most part) accept it. I have certain people who will be on both sides of the wall, just depends on their mood.
I think they are just happy that I am trying to save money now and its only going towards one thing and not 50 different things. They may not understand why I love them so much, but they understand it makes me happy, which makes it worth while. They know it puts a smile on my face when I'm down or have had one of those unlucky sorta days....
So to answear your question.... When YOU want. The age frame is only for an age range...not limit. Maybe for those people looking for something to buy for that age range, they might go "oh this might be good" because they see the range... It isn't an age limit.