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Men experience a gradual, yet steady decline in testosterone with age. Men lose approximately 1 percent of their testosterone each year after the age of 30. This means that a man in his 70s could have only 50 percent of his original testosterone level.
The ongoing loss of this male sex hormone is sometimes referred to as male menopause or andropause. And, like female menopause, it can bring with it a number of undesirable symptoms, including fatigue.
https://www.increasemyt.com/daily-trt-articles/testosterone-a-fatigue