> So the greatest physics, maths, poetry and pop music are done by people in their 20s.

I think there's a chance this is itself a type of selection bias, because you're over-indexing on the famous. And fame has consequences.

Many music artists end up trapped by their own fame (and attendant expectations) and fail to update themselves over time, thus falling out of the limelight. But there are plenty who defy this trend. Tiesto, David Guetta, Kaskade, and Armin van Buuren in EDM, for example. Coldplay is another great example. Love them or hate them, they're still putting out chart toppers.

Something similar is true for scientists in my opinion. I think Richard Hamming had the most incisive analysis of this in 'You and Your Research' [1], which is worth reading in its entirety.

> But let me say why age seems to have the effect it does. In the first place if you do some good work you will find yourself on all kinds of committees and unable to do any more work. You may find yourself as I saw Brattain when he got a Nobel Prize. The day the prize was announced we all assembled in Arnold Auditorium; all three winners got up and made speeches. The third one, Brattain, practically with tears in his eyes, said, “I know about this Nobel-Prize effect and I am not going to let it affect me; I am going to remain good old Walter Brattain.” Well I said to myself, “That is nice.” But in a few weeks I saw it was affecting him. Now he could only work on great problems.

> When you are famous it is hard to work on small problems. This is what did Shannon in. After information theory, what do you do for an encore? The great scientists often make this error. They fail to continue to plant the little acorns from which the mighty oak trees grow. They try to get the big thing right off. And that isn't the way things go. So that is another reason why you find that when you get early recognition it seems to sterilize you. In fact I will give you my favorite quotation of many years. The Institute for Advanced Study in Princeton, in my opinion, has ruined more good scientists than any institution has created, judged by what they did before they came and judged by what they did after. Not that they weren't good afterwards, but they were superb before they got there and were only good afterwards.

My view is that fatalistically assuming that age is an obstacle to creative output obscures the hidden variables that are genuinely determinative.

[1] https://jamesclear.com/great-speeches/you-and-your-research-...