Well, I was at the pet store.....for some reason it's like it waits for me to walk in and just see something wrong....but anyways, I always walk over by the rat cages and talk to them. And this itty bitty little rat came out of the wooden house they had in there for them and it looked waaaaaaaay to small to be weaned fully. So, me having the soft spot for rats that I have and me being VERY upset at the pet store. I bought him, (they made me pay 17.99 ) and he is here and is on a formula diet right now. If anyone could give me an estimate of his age I would be very happy.