Tons of studies demonstrating this and show a 1% decline in T per year. The graph is from the Massachusetts study I believe.
Discussion
I'd put SATs on weak money being a prior causal...
Still just curious on the subjects that they use for this data still. If studies are being done I’m just curious on how they gather the T levels is all. Are subjects normal or are they from hospitals, sample polls of small groups etc 🤷♂️✌️