hmmmm there seems to be alot of mixed thoughts on tis topic but i would say if u feel they are capeable of doing it i would let them do it. and if you dont, well how much can a child hurt a snake by touching it with one finger. i had a 7 year old at my house and she was very eager to see one of my snakes, so i took out my BP. she was very calm to entire time so i just told her to put her hands out and just let the snake do it's thing. well she caught on very quickly and now when she asks if she can hold a snake i have no worries (but obvisly i supervise all handelings) so i would talk to these kids first insted of ruleing them out. good luck.
"Those who desire to give up Freedom in order to gain Security, will not have, nor do they deserve, either one." -Thomas Jefferson