As men hit their 40s, hormonal and physiological changes occur. You might notice a reduced sex drive, lack of energy and weight gain despite everything about your lifestyle remaining the same.

The good news is these changes aren't the be-all and end-all for this new stage of your life. Let's look at some important changes you might experience and see what experts have to say about keeping on top of them.

Decreased sex drive and sexual dysfunction

Reduced testosterone levels in older men can go unnoticed. A clinical paper published in The Journal of Clinical Endocrinology & Metabolism reported testosterone levels in men decline by approximately 1 percent per year after age 40.

The same study explains that low testosterone levels can be linked to:

  • Abdominal obesity
  • Diabetes
  • Dyslipidemia—an unhealthy level of cholesterol and other lipids in your blood
  • Low bone density
  • Reduced muscle mass
  • Impaired sexual function
  • Depression
  • Frailty