UFC Hall of Famer Randy Couture finally retired from mixed martial arts at age 48 after his UFC 128 KO loss to Lyoto Machida in April 2011. Couture's amazing MMA career began at UFC 13 in 1997 when he was 34 years old. He originally retired in 2006 after losing a Light Heavyweight title fight to Chuck Liddell but came back in 2007 to take the Heavyweight title from Tim Sylvia at age 44.

That was the beginning of an amazing 4 year run in which Couture went 5-3 with every bout a UFC headliner. Not bad for an old man.

Naturally there has been a great deal of speculation about how Couture did it. This being a cynical age, some of that speculation has involved things like testosterone replacement therapy -- something Couture's former teammates Dan Henderson and Chael Sonnen have both made use of, sometimes with official sanction and sometimes without.

Couture spoke to MMA Frenzy about TRT and we have his comments after the jump...

"There is such fine line with all of the anti-aging stuff that's out there now. TRT is generally something a guy does in their 40's and 50's when their natural production of testosterone drops off. There are other natural ways to boost your own body's production without replacing it and it's safer as well, but it still should be under the care of a physician," offered Couture on the topic. "It's a very fine and a very personal thing and there is no easy answer. An athlete is using his body to earn a living and entertain the fans, they want to get the most out of themselves, but sometimes they go too far with it."

You have to hand it to Couture for NOT being one of the UFC Hall of Famers who's failed a drug test (Royce Gracie and Ken Shamrock, I'm looking at you.)