I was natural at 17. I lived in the Phillipines with high humidity and I swam a lot. I knew relaxers wouldn't do a damn thing in that weather. I wasn't very creative with my hair so it was usually in french braids or a bun. During the dry season, I'd do an occasional rollerset or blowout. It was probably midback/waistlength at the time but no one knew because I rarely wore it out.
Interestingly, being natural wasn't really cool in the late 80s and I definitely marched to my own drummer. I'm "facebook friends with some high school friends now and looking back at my tagged pictures, I realize that my hair is still the same. The only difference is I am using much better products, I have gotten better about creative styling, and I know how to wear it out with twist/braid outs. I guess I was ahead of my time