However, it's the matter of how strong that causation is and how hard are you going to rely on it. Because if you think that someone in their 30s is likely to be be significantly more experienced and wise, it also means that you should think that someone in their 50s is likely to be significantly burned out and slow.

My point is: the correlation (and underlying causation) is there, but it's not strong enough, compared to differences between individuals.