You are right. And there's literally no limit onto what you can do. I know about a kid, who at 13 (in 1993) wrote some 300kb of C code that controlled medical equipment :-o which had been installed in a bunch of hospitals. It was a fun project for that kid (his father's company had built the hardware). And the equipment worked pretty well too. Did a lot of good. Also, before he had finished high school, some code that was derived from his code was launched into space. So you see, there's no limit!
Unlike many other professions, your age is not a limiting factor.