Cullen, who is in his 19th season in the NHL, doesn't feel any of that and said he does not feel like a 40-year-old hockey player.
"I really don't, and I feel really lucky to say that," he said. "It's a tough game and to be able to play this long I know I've been really blessed and I feel really fortunate to be here, I really do. Even moreso I feel blessed to feel as good as I do. Our bodies eventually give out on us but I am in a position right now where I feel as good as I think I ever have playing the game of hockey. So, no, I don't feel like a 40 year old now."
Cullen credited the Penguins' style of play and his role as a fourth-line center as reasons why.
He has averaged 13:33 of ice time per game in the playoffs after playing 13:55 per game in 72 games in the regular season. Last season, he played all 82 regular season games and averaged 13:52 of ice time per game. He averaged 13:49 per game in 24 playoff games.
"I've learned throughout my career that it's really important where you fit on a team," he said. "I think of [Penguins defenseman] Trevor Daley last year as a great example, going to Chicago and it just wasn't a great fit. He's the same player, and a great player, and then he comes here, finds a fit and excels. I understand that side of it. This is a perfect fit for me at this point in my career, the way we play, the players that we have, the role that I'm used in."
So much so that Cullen said he can't envision himself playing anywhere else
"Not that I can think of, honestly," he said.
A lot of that has to do with how living and playing in Pittsburgh has worked out for his family, including Cullen's wife, Bridget, and their three boys, Brooks, Wyatt and Joey.
"Pittsburgh has just a perfect fit in all regards for my family," he said. "Last year there was a lot about my family and the boys and what a great setup we have. That's been just unbelievable. The community has been awesome. And for me the hockey has been unbelievable. It couldn't go any better.
"When you're sitting here in your second Stanley Cup Final in two years, obviously it's been a dream."