At what age did you become a “True Christian”

I’m a teenager and I’m quite curious. As far as I know in my school there are little (which I haven’t found) to no christian’s. I sometimes feel like I’m one of the only one actually serious about God around teens my age. I wanted to know at what age do most people start getting serious about christianity (like actually wanting a relationship with God and striving for it, not just church on sundays when you have to.)

(Edit: What age did you become “Christian”) I added true because dramatic flair I didn’t think people would take it the wrong way I’m sorry 🫡