T levels also depend on where one grows up rather than where they end up living: https://www.everydayhealth.com/mens-health/where-men-spend-their-childhood-dete

T levels also depend on where one grows up rather than where they end up living: https://www.everydayhealth.com/mens-health/where-men-spend-their-childhood-determines-testosterone-level-study-says/ https://www.everydayhealth.com/mens-health/where-men-spend-t... Does this research provide any insight into why testosterone levels have been in steady decline in the United States for several decades? If a safer, less-challenging environment leads to higher testosterone levels, wouldn’t levels be rising instead of falling? Magid points to trends toward higher rates of obesity and lower rates of smoking that at least partially explain lower levels of testosterone. “There are a number of theories why this might be occurring, and there are those who dispute whether this is either a real trend or what it could mean for male health in the long term,” he says.