Hormonal fluctuations are a normal part of life. Remember when you were a teenager? How life abruptly and suddenly changes, and you couldn’t get a handle on what was going on? The same thing happens as you age.
Typically men’s testosterone levels start to decrease by 1% each year as early as their thirties. And if you are a woman in your 40’s/50’s, watch out! Peri-menopause and menopause may sneak up on you before you realize it’s happened.