There was a similar thread posted a while ago: Junior herpers are the future, let's see those kids with reptiles
My two sons are 2 and almost 4. They both like my reptiles, but my 2 year old in particular really loves my snakes. Whenever he sees one out with me, he comes running over saying “pet?”. And he is very gentle with them. He knows to only use one finger and to not touch their heads. My 4 year old likes my crested gecko better than the snakes. The two year old is a bit freaked out by the jumping!