my little tidbit applies to really anyone purchasing a reptile, not just minors.

I'm 17 right now and I keep monitor lizards (I just had one lay eggs actually) so there are minors who are very good at keeping reptiles.

I speak from experience when I say to people selling, do not tell the person what the animal needs (at first) for any large animal. An ignorant person(minor or adult) will not care or listen anyway. With anything "large" you should quiz the person on basic knowledge of the animal (how big it will get, how old it will get, and what/how much it will eat, ENCLOSURE SIZE) first (to show it is not on impuls) and if they cannot do that, then do NOT sell them that animal. it may be tedious for if you're at an expo with a lot of people, but it can be the difference between being a good owner, and an animal being released into the wild.

That's my little tidbit anyway. just an idea.