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Age correlates with experience.

If you've been something longer, you've had time to learn what works and what doesn't, and why.

Thus, you can do a better job at guiding people who are newer to the material.

But if you started programming at 50... that's different than having done it for the last 30 years.

I doubt there are enough such cases to distort the statistics.

That's pretty rare though, I think most programmers in their fifties have been doing it for many years.