 Don't feel like you used to. You used to go all day, all night, without petering out. And yet now, you fall asleep after lunch. Happens. And maybe you're not even in the mood. And your wife, your girlfriend, she's good looking. And you're still not in the mood. You never want to do anything like that. Well, all these issues could be a sign of low T, low testosterone. And it's not only happening to guys in their 40s, 50s, and 60s. There is now an epidemic of young men, even in their 20s, with low testosterone.