i have the critter nation double unit and added the add on unit i have one chinchilla he loves it and i love ferret.com super fast shipping he has lots of shelves hide outs chin spin ledges fleece tunnels and wood boxes plente of room to jump and hide and play
I have the Chin Spin and my chin loves it when he was about 6 month old i got it and he has never been on a wheel before i put the chin spin in his cage and he went right on it going a 100 miles an hour now :)
when i bought my chin from petsmart they told me he is about 3 month old if you have the paperwork when u bought yours maybe they could find out for you