You already know how testosterone can bring your sex life back from the dead. Now, the latest research shows how it can keep the rest of you out of the grave as well.

In fact, this manly hormone can slash your risk of two of the greatest killers of seniors: heart attack and stroke.

Swedish researchers examined testosterone levels of some 2,400 men in their 70s and 80s, then tracked them for an average of five years.

Over that time, they found that men in the top 25 percent of testosterone levels had a 30 percent lower risk of cardiovascular problems including heart disease, heart attack and stroke than everyone else -- and that's even after adjusting for risk factors including weight, diabetes and a previous history of heart attack and stroke.

The study doesn't go as far as to prove that testosterone is the reason for the stronger hearts -- but it's certainly not the first to make the link.

A study last year found that men in their 70s and 80s with the lowest levels of testosterone were more likely to have at least three of five signs of failing health -- including heart disease, chronic fatigue, and difficulties getting around.

Another study even found that men with the lowest levels were most likely to die younger.

Clearly, you need this stuff… even if you think you're no longer interested in sex. Now, the question is how to get it -- because if you're past middle age, you almost certainly need more.

First thing's first: Head to a physician experienced in natural hormones. He can check your levels, find out where you are, and give you what you need the right way.