Even if you didn’t they still would have gotten a hold of you, when I got back from boot camp and worked in the recruiters office for a week, they had me calling people, they get lists from schools or something but I had basically a phonebook with all the H.S. students in the area with addresses and numbers.
Although taking the test made it look like you showed interest which is most likely the reason for them constantly bothering you LOL.
And being a minor means nothing, I enlisted when I was 17 (with parental approval).