The longest lived one I have ever heard of is a year and a half. There is a link earlier in this thread to his story. I will try to get updated pics, but he hasn't grown at all! I don't know how long he wil make it, every day I go out there and I cringe until I see him moving around. Sometimes he is hard to find, the normal babies just sort of sit over him! He is so little he can just tuck himself into a little round ball and sit under their bellies!
I have thought about bringing him in the house, with his own little dishes and the like, but I saw the other day the mom is still letting him nurse. Someone else on here said that sometimes a peanut will only survive for as long as they are nursing, because of digestive problems, so I am really leery of taking him away from his mom.