It's a bit hard to answer, because the most talented I know became more talented as they aged (so I'm tempted to answer their current age which is 30s or 40s be

It's a bit hard to answer, because the most talented I know became more talented as they aged (so I'm tempted to answer their current age which is 30s or 40s because of my own age range) but they were definitely noticeably more talented than their peers when young, too. They would have been decent hires at 17 for those who were coding then -- not better than the best experienced people, but decent, definitely leagues above other first year students. Some of them weren't coding until 25 or so but in that case same applies -- they were noticeably very competent at 25, and better at 35 than they were at 25. Obviously motivation, desire to stay in tech, specific technology stack, etc, varies.