I know you explicitly don't want to play the "I'm a kid" card, but you're kind of doing that just by mentioning it in this follow-up post. I think 17 is probably the age when you just don't have that card to play anymore.
I released my first OSS project (here) at 17, and mentioning my age didn't even cross my mind. You just take the feedback and criticism and reiterate like everyone else, because you won't have an excuse forever.