Amir Khan (32-4, 20 KOs) believes that he's still in the "peak of his career."
Khan will return in his second fight of the year on September 8th in Birmingham, when he faces Samuel Vargas.
The Bolton boxer snapped a two year layoff in April, when he knocked out Phil Lo Greco in only 39 seconds of the first round.
Khan is hoping for a very explosive performance against Vargas.
He is currently, according to Khan, doing a number on some of the much younger sparring partners.
Khan is being trained by his new coach, Joe Goossen, in California.
"I still feel strong, I was running against the young 23-year-olds (in training camp), then sparring against 25-year-olds who are at the peak of their career - and I was out boxing them," said Khan.
"I was doing so well, so I was thinking to myself 'age is just a number for me'. I work harder than most young fighters. My work rate was a lot harder than theirs, and this was against young up-and-coming fighters who I believe will become world champions. I really feel young, explosive and strong."
The goal for Khan is to land a major fight - preferably a world title fight.
He appears to be targeting a potential clash with former sparring partner Manny Pacquiao, who now holds the WBA's "regular" title at 147-pounds.
Khan expects to fight for a world title by the end of 2018 or in early 2019.
"This next fight is very important to me, beating Vargas, not just beating him but also looking really good against him will only take me onto the big world title fights," Khan said.
"I'll be challenging for a world title in my opinion by the end of the year, or early next year. It's how you look after your body. In training camp I worked hard, I never cheat myself. At 31, I'm at the peak of my career."