Carl Froch has warned George Groves that he is in the best shape of his career.
The Cobra will defend his super-middleweight world titles against fellow Brit Groves in November.
Froch is 36, a full 11 years older than his challenger, and will be out of the ring for six months since his 12-round win over Mikkel Kessler.
But, although the father-of-two insists he might not get any better, he is confident he will still be in his prime when he locks horns with the Londoner.
"I think I've been peaking for the last two or three years," he told Ringside - Froch-Kessler Special.
"At 33, 34 I felt great, 35 brilliant. I'm 36 now so I'm probably at the top of the hill.
"I've been climbing the hill for many years and I'm probably at my peak. I'm hitting my targets in running, press-ups, pull-ups, sit-ups, sparring rounds.
"I'm at the top and I'm not going to get any better, any fitter any faster but I'm definitely not over that hill."
Froch has readily admitted that four more fights, rather than four more years, will bring his career to a close.
Kessler, 34, has revealed that he would like a third and decisive showdown and if it happens, it will be 2014 at the earliest.
But the Cobra warned that his maturity and experience puts him up there with the very best in the business.
"I think age will eventually catch up with me," said Froch. "But I'm a very, very young, fit, healthy, strong and determined 36-year-old.
"Look at Floyd Mayweather, Manny Pacquiao, (Sergio) Martinez, look at a lot of the top fighters over the years... 36-years-old?
"I'm very much in my prime."