Quite an unusual phenomena that several studies have confirmed as of the recently is that the mean testosterone level in men (of the same age) has been decreasing over time. Studies have ..”revealed a “substantial” drop in U.S. men’s testosterone levels since the 1980s, with average levels declining by about 1% per year. This means, for example, that a 60-year-old man in 2004 had testosterone levels 17% lower than those of a 60-year-old in 1987. “ Lower testosterone is associ