Kids section

Did you ever used to enter those reading competitions when you were a kid? Where you use to gain medals if you read a certain amount of books? I've done it for as long as I remember but when do you stop being a kid? Do you still count as one if your still reading "kiddy books" or is there an age limit. Everybody calls twelve year olds; tweens but is that a kid or a teen? How do you classify a book and putting it in a certain section? Maybe I'm just being stupid!  Also the kids section has the best furniture: sofas and bean bags, the childhood favourites! If we compare yourselves to the oldest person on Earth then who says you aren't kids? Okay, everybody, but you can always imagine :)