What is the legal age to run a site?

[ZiNgA BuRgA]

Whatever you say, regardless of it being right or not, is completely useless if no one cares.  No one cares about age laws on the internet, and I don't see anyone enforcing anything on the regards, so it's pointless.  Besides, how does one confirm the age of the other party?  I doubt you know or can confirm my age with any certainty.

As for MyBB trying to appeal to larger businesses, perhaps paid support is a way to go.  I personally don't think MyBB should target larger businesses at this point - it's not their strength.  Age has little to do with this.  If I were to provide paid support over the internet, there's no contract I sign anywhere, though there's still an implicit contract, similar to one buying something from a store.