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This isn't just a Japan problem...this is a worldwide problem. Testosterone/sperm levels are declining everywhere (and not just in humans).

https://www.esquire.com/lifestyle/health/news/a47476/dog-spe...

https://www.urologytimes.com/view/testosterone-levels-show-s...

https://www.cnn.com/2022/11/18/health/sperm-counts-decline-d...

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what evidence do you have that population decline has anything to do with T levels? it's a pretty well known and established phenomenon that as societies modernize, people choose to have less children. I have not seen evidence to suggest the same amount of people are trying to have children and just can't (especially as fertility technology becomes more accessible)

Human birth rates aren't declining because men are infertile now. You got millions of those things and you only need one of them to make it.

Take a zinc pill if you care.

This is like saying you only need one particle in the accelerator.

As Wheeler considered, you need only one electron.

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