Special Report: Male Menopause

"I was irritable a lot," George Watt said. "I was depressed, if I didn't know better, I'd swear I was going through menopause."

Pat worried what had happened to the George she had married? George, who's 60, wondered too.

"We talked about it and we determined I needed to check," Watt said. "Something was wrong and I needed to check with somebody."

Their family doctor hit the nail on the head. He immediately suspected a lack of testosterone, the hormone that effects sex drive and mood.

"He found it was low and we started the shots," George said.

He gets a shot every other week and now their sex life....

"There wasn't any then, but it's there now. Yep!" George said. "I'm not as grumpy, I'm not as stressed out."

George's story is not uncommon. Starting in a man's 40's, testosterone levels start to slowly decline.

"Changes in testosterone can affect everything about a man," Male Menopause author Jed Diamond said. "It can effect his bone density, his muscle mass, it can affect his emotional sensitivity."

Some doctors worry testosterone therapy has gotten too popular and hasn't been studied nearly enough. But it's certainly easy to see why men like it.

"It's been great ever since I got the shot," George said.

And things are better with his wife and with his grandchildren.

"(And) better in other places!" George said.

Most experts only recommend shots if testosterone levels are abnormally low because in some cases the shots have caused complications, such as prostate problems. If you think you have a problem see your doctor.