Male fertility rates have fallen drastically. https://www.cnn.com/2017/07/25/health/sperm-counts-declining-study/index.html https://www.cnn.com/2017/07/25/healt

Male fertility rates have fallen drastically. https://www.cnn.com/2017/07/25/health/sperm-counts-declining-study/index.html https://www.cnn.com/2017/07/25/health/sperm-counts-declining... Male testosterone production has been decreasing as well, at a population level. https://www.ncbi.nlm.nih.gov/pubmed/17062768 https://www.ncbi.nlm.nih.gov/pubmed/17062768 Also interesting to note that medical academia has been gradually lowering the requirements for what is considered a healthy testosterone concentration. Minimal acceptable bioavailable testosterone for a healthy young man used to be considered on the order of 500ng/dL, now it’s generally considered around 300ng/dL.