Since this is a program to monetize your island and it is strictly specified that you must be of legal age, I wouldn’t risk using your parents’ account. This could violate Epic’s rules, and as a result, your account could be suspended.
I don’t know how long until you reach the legal age, but in the meantime, take advantage of this time to absorb all the knowledge about the engine and apply it to your awesome island
Just adding that you don’t need to be in Support-A-Creator but Island Creator to publish Projects (Assuming this is why you’re on the dev forums) unfortunately that still requires being 18+ and has similar requirements to the sac code, just without the 1k follower requirement