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Re:Testosterone levels show steady decrease among young US men by fred_is_fred on Thursday January 14, 2021 @02:23PM (#25780995)
Violent crime in the US has been dropping for some time now. Reduction of environmental lead (gas and paint) is one of the factors as well. https://www.medicaldaily.com/leaded-gasoline-linked-rise-and...

Also I would guess that at 42 you are much less likely to be in a situation where a physical fight might start than you were in the 1990s - at bars at 2am for example. I know that I am.

Re:Testosterone levels show steady decrease among young US men by mrec on Thursday January 14, 2021 @04:36PM (#25782953)
Yes, this would be my first suspicion too, especially for a comparison with the 1990s.

> For instance, the peak in leaded gasoline use in the late 1970's corresponds to a peak in aggravated assault rates in the late 1990's in urban areas across the United States.

https://en.wikipedia.org/wiki/Lead_poisoning#Violence

Re:Testosterone levels show steady decrease among young US men by flukus on Thursday January 14, 2021 @05:03PM (#25783309)
I wonder if this could be the causal link between the two that has always been missing, lead -> higher testosterone -> more violence.