Why are men's testosterone levels decreasing? - Parla

Fr article: “Seventy-year-old men in 1987-89 had an average testosterone level that was almost 100 points higher than even 55-year-old men in 2002-04, meaning that the average 22 year old man today has an average testosterone level roughly equal to that of a 67 year old man in 2000. Therefore, it’s likely that your testosterone levels are 1/2 those of your father and undoubtedly significantly less than your grandfather.”

Blood work can be done to find out a man’s testosterone levels.
Some natural ways to boost testosterone :
https://www.forbes.com/health/family/how-to-increase-testosterone/