Maybe heavyweight champion Vitali Klitschko just expects to be asked about his age, which is why he brought up the number without being asked about it in this particular interview. Klitschko is 40, after all, and has specks of gray hair, and his age has become a regular topic of conversation.
Even though he is supremely conditioned and has been utterly dominant in the seven title defenses he has made since ending an injury-induced four-year retirement and immediately reclaiming his old title in 2008, his age always comes up.
"I'm 40, but I never think about that," Klitschko said without being prompted. "If I look in the past, I would be upset if someone told me when I was 20 or 25 that I would be fighting at 40. I never would believe that. But right now I feel like 25. I never think about age because I feel too good.
"I had bad times with injuries, but that is all in the past. I know if I will be 100 percent healthy that nobody can beat me."
England's Dereck Chisora will try to test that theory when he faces Klitschko for his world title at Olympiahalle in Munich, Germany, on Saturday (Epix and EpixHD.com, 4:30 p.m. ET).
The 28-year-old Chisora (15-2, 9 KOs) doesn't have much professional experience, especially when compared to Ukraine's Klitschko (43-2, 40 KOs), who has almost the same record in world title fights (13-2, 11 KOs) that the challenger has overall.
But Chisora is a hungry fighter who was twice supposed to take on Wladimir Klitschko, Vitali's younger brother and fellow heavyweight champion, before those bouts were called off.
"The Klitschko team don't like me because I'm wild and unpredictable and I'm not like any of the other challengers that bow down in front of them," the outspoken Chisora said. "It scares them because they have no control over me. The way I'm going to fight, he won't be able to keep up with the pace I'm going to set. It will be at a hundred miles an hour, and his old legs won't be able to keep up. I'm not scared of him. He's human, he bleeds and so do I. I'm looking forward to this now, it's so close.
"It's the end for Vitali. I promise you, I will end the Klitschko reign and cause a massive upset in my magic round -- eight -- that will be felt around the world."
Klitschko and Chisora had gotten on well -- smiling, joking around and slapping each other on the back -- during most of the buildup to the fight. But at Friday's weigh-in, Chisora slapped Klitschko across the face with a right hand (although Klitschko restrained himself from retaliating). Even before the incident, Klitschko said he is taking this fight very seriously and isn't underestimating a much younger opponent with a reputation for having a strong chin.
"I'm looking into Chisora's eyes and I see a young fighter who wants to win the world title," Klitschko said. "When he said that he was going to finish me in Round 8, I realized that this guy is serious and I have never prepared as hard for a fight. But I've told him that he's not the one to stop me. No one can. I'm going to show everyone why I am the champion and why I have ruled for so long."
Although Chisora is coming off a split decision loss to Robert Helenius in December in Helenius' native Finland, the result was decried by many as one of the worst of 2011. Chisora, who is 6-foot-1, spent the entire fight pushing around Helenius -- who, at 6-6, is only an inch shorter than Klitschko -- and dominating the much bigger man on the inside, only to be the recipient of what many believe was a hometown decision.
"It's very important to fight against a good fighter, and who else is there?" Klitschko said. "Me and my brother, we beat so many of these boys who were high in the ratings. Right now, a new generation is coming up, and Chisora is one of them. He looked very good against Helenius. Helenius is the same size as me, and everybody was talking about Helenius, who had huge potential, but [I thought] Chisora beat him. I like opponents who make pressure and are very aggressive. I like the style of Chisora very much and think this fight will be very interesting.
"He is young, hungry, aggressive, confident, and definitely this fight will be interesting for everyone -- and for me also."
Klitschko, who always seems to enjoy the preparation of a training camp, relished his camp in the Austrian mountains, getting ready to fight Chisora, even more than the usual proceedings.
That's because, he said, it was the first time in eight years that he and Wladimir have shared a training camp. The reason the brothers were able to come together this time was because they have fights so close to each other. Wladimir is preparing for his own title defense against former cruiserweight champion Jean-Marc Mormeck (which will also be on Epix in the United States) on March 3 in Düsseldorf, Germany.
The brothers have different trainers and, having long vowed never to fight each other because of a promise they made to their mother, don't even spar with each other. But they are best friends who spent a lot of time together in this camp.
"It is good to see my brother every day," Vitali said. "But I have my program and Wladimir has his, and we sometimes train at different times. But we have been able to spend more time together in the boxing gym and also out of the gym. It's great to be able to talk to my brother in training camp. We discuss boxing, sport, politics, life."
Vitali said he hasn't pondered the end of his career. He hopes to take care of business against Chisora and this summer defend against former titlist David Haye of England, whom Wladimir routed in a unification fight last summer. Those talks have stalled, but Vitali very much wants the fight so that he can knock out Haye, who has had so many bad things to say about the Klitschko brothers in recent years.
Still, Vitali said he isn't making any long-term plans.
"To be honest, I prepare for every fight like it's the last one in my career," he said. "I do my career step by step. There is no reason to make plans for a year or next couple of years. I understand I am not the youngest heavyweight and that one day I say thanks and goodbye to boxing, but right now I don't think about it.
"I feel like nobody can beat me. If I feel I lose the power, the speed, then that is a good sign and at that moment it will be important to think about retirement and say thanks to everyone. But right now I have sparring partners 10, 15 years younger than me and nobody has the same speed or the same power. Nobody has the same experience. I hope in the fight I will be the same quality as I have in the preparation. I hope I show a good performance against Chisora for an old man."
Dan Rafael is a boxing writer for ESPN.com. Follow him on Twitter @danrafaelespn.