And it isn't chess. A lot of programmers who are good start in their teens or younger may be but it isn't really something you are groomed for, at least I know no one in my personal life who is like that. The fact that passion brings you a lot of the way vs. professional training or just prodigy as a youth (think olympics, gymnastics, basketball, chess, e-sports, etc) means that really you can start any time.

Like others are saying, the only difference where age might matter is life circumstances, it's less about mental faculties (you don't need a quick reaction time to hack unless it's a competition may be) beyond logical reasoning, which people of any age can master.