I'm not sure the age. I'm going to pick them up at the local Petco, but they all look pretty solid. Clear eyes, alert, etc. Their housing there sucks and I'd like to snatch them up.
I wasn't going to use sand, from what I understand they don't even live in sandy environments in the wild. I was thinking maybe reptile carpet just cause it sounded to be of optimum comfort.
But one more question; These geckos, while appearing healthy, are really not taken care of well. One dry hide and three animals in a 5 gallon space. Is it likely that they have unobservable illness?