For the most part, minors are perfectly able to execute contracts. People are sometimes reluctant to contract with minors because minors can, in some circumstances, void contracts that are not in their interest. But as a general rule, contracts with minors are not impossible or illegal.  

Ah, yes, that was the other critical part of the response to Sarah that I missed, thanks :)

Minors can enter contracts. They just have no legal obligation (or close to).

Tom