For years, Robert believed his lack of energy was simply part of getting older.
At 56 years old, he noticed something had changed.
Even after a full night of sleep, he woke up feeling tired.
His motivation at work dropped.
Activities he once enjoyed no longer felt the same.
“I thought it was just age,” he explained.
But according to some health researchers, there may be another reason many men start feeling this way after 45.