Most people arent aware but the testosterone of american males has been in decline. There have been studies showing that in general the testosterone levels of american males between the ages of 23 and 53 in america is lowest when compared to other nations around the globe. There are many theories as to why this may be occurring but one of the most popular to gain traction in the scientific communities is the the theory of decline T when biased against the female dominance of a given culture.