The 35-year-old is in great condition 11 weeks prior to his fight with the Dane, and believes that he has never been stronger.
The 'Cobra' lost his WBC super-middleweight title at the hands of Kessler in 2010, but he has no doubts that he can avenge that defeat.
"As I've got older I've got stronger. I diarise everything. Everything's written down and my runs are improving, the weights too," Froch told Sky Sports News. "I'm at my physical peak.
"I'm sure I'll go over the hill at one stage, but at the minute I'm hitting everything I need to hit. Physically I'm in my prime and mentally I'm so much tougher than what I was when I was 25.
"Success breeds confidence, and I've had that much success I go into the ring very confident and that's half the battle in boxing, believing in yourself. I'm 36 in July, but if the mind's willing the body can be worked into doing whatever you want."
Froch clashes with Kessler on May 25.