You still failed to answer the question. Humming tunes in the womb isn't composition. Just sitting around all the time and having musical ideas forming in your head isn't composition. Composition isn't just having ideas, it's transferring those ideas into a medium that can be communicated and shared with other people, whether you're writing sheet music or guitar tabs, or making a recording of your ideas, or simply performing those ideas consistently over and over again.
You're throwing down more melodramatic silliness like "musicomania" and Spider-Man characters when the question can easily be answered with something like "I was in high school when I wrote my first piece for solo piano."
Anyway, to answer the question, I got my start with composition in high school. I used it as a way to try to understand music theory more in an effort to improve my skills as a trumpet player, and ended up switching entirely over to composition after I left high school.