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I don't know either, but I would not make this guess, because cultural evolution tends to happen at a much faster pace than physiological (biological?) evolution. Physiology will not change much in 20 years, but culture could change drastically in the same timeframe.

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Wasn't talking about evolution, was talking about stuff in the environment (food, plastics, etc) that affects physiology.

Replace "evolution" with "changes". I don't necessarily mean Darwinian evolution (if that's what you thought).

There has been a significant population level decrease in testosterone in men. It's at around 1.2% per year when adjusted by age.[0] Similar effects have been found in other countries too.

I think this is what he means when he says physiological.

[0] https://academic.oup.com/jcem/article/92/1/196/2598434

That study had roughly 3k participants, from the Boston area. In my opinion, the are more than probably many factors that influence testosterone production and that’s not sufficient evidence to declare a population-wide crisis.

https://www.forbes.com/sites/neilhowe/2017/10/02/youre-not-t...

There are studies linked there.

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