T.G.
I dont think he is to young, we brought out a potty chair for our daughter when she started being interested in us going potty (around 16/17 months) Granted, she wasnt fully potty trained unitl after age 3, but I like the idea of not forcing her into anything and letting her do it on her own. Our son is going through the same thing now, he's had the potty out since he was 18 months old. He will be 3 next month and he pee's but doesnt poop on it. But yes, I think if they show interest in it, and are not pressured to use it, they are ready at 18 months.