This is a man who was an Olympic wrestler in the 1990's and is still considered one of the top fighters in the world in the closing months of 2011.
That kind of longevity is impressive, and now that Randy Couture has retired, it could be argued that Henderson is the best "old" fighter in the UFC.
Of course, that isn't to say he is alone in this. There are plenty of mixed martial artists out there who are still able to compete with the best.
Here are the top five fighters outside of Henderson who prove that age is just a number.
Perosh had a stint with the UFC before in which he dropped two fights before getting cut.
After fighting outside the promotion for a few years with mixed results, he took a fight with Cro Cop on one day's notice when the original opponent dropped out.
He was beaten brutally, but Dana White was so impressed by him that he still gave Perosh another UFC contract.
Perosh didn't let it go to waste and has now won his last two fights in the UFC, both by guillotine choke.
He is now a successful UFC light heavyweight, and though it isn't certain how long his career with them will be, it's not bad for a man who just turned 38.
At one point, Hunt was at the top of the heap in PRIDE. He had taken close decision wins against a prime Cro Cop and Wanderlei Silva.
He then lost a few fights in a row, and when PRIDE folded, decided to continue fighting in Japan instead of jumping to the UFC.
Hunt didn't win one fight in his entire time while fighting in DREAM, and when those fights dried up, he was able to get the fights owed to him by UFC.
He failed in his first outing in the Octagon, but was miraculously able to stay with the company.
After his first loss, though, he turned around and knocked out Brock Lesnar's sparring partner, Chris Tuchscherer, and won the knockout of the night bonus, and then beat Ben Rothwell by decision.
Before those wins, he had lost his last six.
Now he is headed back to Japan, where he will face Cheick Kongo at UFC 144.
He is 37 years old.
Hunt's opponent also makes the list as an older fighter.
It is hard to believe it thanks to his impressive physique, but Kongo is actually 36 years old. The Frenchman must have found some way to stop aging because not only is he young-looking, he is also one of the more impressive heavyweights in the UFC today.
He has won three of his last four, with only a draw sandwiched in between them.
His last win was against the younger Matt Mitrione in which he soundly beat the younger fighter all the way to a clear unanimous decision.
His only two losses in the last few years have been to Frank Mir and Cain Velasquez.
Matyushenko is yet again another veteran who is on another run with the UFC.
This is actually Matyushenko's third time with the company, and it also happens to be his best one as well.
Matyushenko was respectively 1-1 in his first time and held a record of 2-1 the second time he fought for the UFC.
Now he is 4-1 in his current time with the promotion, with his only loss coming from current light heavyweight champion Jon Jones.
It should also be mentioned that though Matyushenko's first two fights in this last run were decisions, his last two fights have ended with him knocking his opponent out.
Not bad for a 40-year-old man.
It's hard to believe that the middleweight champion is actually 36. He hasn't really aged since he came to the UFC, and he has never lost a fight.
He doesn't even seem to have diminished. If anything, he seems to have gotten better.
He may now be a little less prone to taking risks, but he is still as quick as ever and able to counter-strike any opponent he steps into the cage with. While most fighters are starting to lose their edge at this time, Silva seems like he is still in his prime.
The only problem with Silva's age is that he just might grow old before he gets a chance to get another legitimate challenger.
It would be a shame to see Silva grow old or retire before the fans could get one more exciting fight from him, but this "old man" is just that dominant.
Maybe it could be against fellow "old" fighter Dan Henderson in a rematch.