I just got one like..... yesterday! They are little virtual pets sorta simmilar to Tamagotchis. Hmmmm...... you can choose from a variety of characters, but on seperate ones. I got a puffball (Sooo cute!!!). There are also Bunnies, Tom Cats, Scorpians, and Pixies. They are soo fun!! No. They do not get a year older everyday. It only says how many days you've had that one; it doesn't age at all, I don't think!
I don't know what Nanopets are, so I couldn't answer that one. Oh!!! Guess what?? I was just reading the directions and it ssays they can't die! Isn't that cool?
I did find a site! It's www.gigapets.com! Hehe! You can explore, dig for stuff, and earn Cut, Intellagent, Cruel, and Nice points, too! I think I've said enough.