I don't know how old they are yet. I got them from a pet store (the only breeder I knew about had to put them all down due to illness). The store was useless in giving me info (even told me they drop their tails, not their fur, on my last phone call to them). We have a vet visit tomorrow to make sure Kira doesn't have anything (since she bit me so badly!). So, we should know by then. It's a good point though. Maybe I"ll get a normal one that I know they are used to. I haven't seen Kira on it, but M'noke loves it. She probably doesn't let Kira go on it is my guess, but I don't have room for two!
Thanks everybody, any input is welcome, I want to get the right wheel this time!