Sen. John McCain (R-Ariz.) in a new profile worries aloud about the physical effects of retirement, but also says he doesn't want to grow too old in the Senate.

McCain has said previously that he is considering seeking reelection in 2014, when he will be 80. He said in a lengthy piece written by The New York Times's Mark Leibovich that he's aware that people who no longer have something driving them often atrophy.

"My grandfather actually flew home from the peace-signing on the Missouri and died,” McCain said, also noting his father died shortly after retiring. “I have seen people age dramatically when they go into retirement.”

At the same time, McCain's daughter Meghan recounts a time when her father saw himself on TV and was surprised at how old he looked.

"He just said to me, ‘I watched an interview with myself on CNN and thought, Who is that old man that’s staring back at me on the TV?'" Meghan McCain said.

The full profile can be found here.