Testosterone levels show steady decrease (down 40-50% approx in last 40 yrs) among young US 
men 
https://www.urologytimes.com/view/testosterone-levels-show-steady-decrease-among-young-us-men
this trend has been consistent since the 80s
https://www.reuters.com/article/idUSKIM169763/
https://www.pparx.org/testosterone-decline/
this correlates to the proliferation of endocrine disrupting chemicals in the food and water supply
https://www.webmd.com/children/what-are-endocrine-disruptors
https://www.endocrine.org/topics/edc/what-edcs-are/common-edcs
microplastics too
https://www.nextavenue.org/how-chemicals-plastic-lower-testosterone/
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I bet it's obesity related. Excess fat is the strongest endocrine disruptor.
Put on muscle, lose body fat, eat plenty of lean meat, butter and spinach, run 3 times a week and you'll be fine.
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