Even if your total testosterone levels are in a normal range, may22.ru your free testosterone can still be low. Free testosterone should make up about 1 to 2 percent of your total testosterone levels. Most men focus on total testosterone levels when they’re trying to figure out if they have low testosterone, but free testosterone levels matter, too. McDevitt says she sees older men who live a healthy lifestyle in their fifties who have the testosterone levels of a man in his thirties. You’d n...