I'm fascinated by that testosterone statistic. I've heard about this, but admittingly haven't read much into the studies. Lack of exercise/more sedentary lifestyles? Diet/processed foods? Modern Pharma/mental health meds? All of the above? It's plainly obvious in just about every aspect you see, even in normal, everyday life.
Sorry, didn't mean to get off-topic, probably worthy of it's own thread.