In fact, he insisted that he truly believes he's capable of playing another 10 years.
"I'm not in the decline like most guys maybe in their mid-30s. In my eyes, I'm not in my mid-30s, I'm 25," Brees said after the first practice of his 14th NFL training camp Friday.
"I think it's a mindset," said Brees, whose rigorous offseason workout routine was chronicled in a cover story by Sports Illustrated this week. "Certainly there are things that come with getting a bit older. A bit more maintenance, a bit more recovery, some of these things. Maybe a little bit different in the way that you train, and I feel like I've evolved along with that. But I think so much of it is a mindset.
"If I tell myself I'm 25, I'm 25. And honest to God, that's my mindset. I could play for another 10 years. And that would be my goal. I mean, I'm taking it one year at a time, but there's no reason why I couldn't do that."
Brees was asked what drives him, even though he's already accomplished so much on and off the field, including a Super Bowl MVP, the first $20 million-per-year contract in NFL history in 2012, and four of the eight 5,000-yard passing seasons in league history.
"I love to compete. I love to win. I love the game of football. I like to do things that people haven't done before or that people would say are impossible or extremely difficult to do," Brees said. "At the end of the day, I'd love for people to be able to look at my career, my legacy and say, 'Man, he did it the right way. He's a pro. And he did for a long time and was consistent.'
"When I say consistent, I just don't want to be at the same level each year. I want to consistently get a little bit better. And I still feel like I'm at that point where each and every year I can get a little bit better."