Mark Seebeck realized that he did not have the same mental focus he used to have at work. He was depending on caffeine to get through the day or else he was able to fall asleep for an hour in the mid-afternoon. Dr. Susan Linder diagnosed him with andropause and put him on bioidentical hormones to boost his testosterone levels. Men begin to lose testosterone in their early 30s at a rate of 1-2% per year. Symptoms of low levels of testosterone, or andropause, include fatigue, memory loss, depression, loss of sex drive, erectile dysfunction, and anger or anxiety.