Walker: I could run in 20 years and be Clinton's age

Wisconsin Gov. Scott Walker (R), a possible 2016 presidential candidate, raised the subject of Hillary ClintonHillary Rodham ClintonIn emails, aide stressed need to ‘clean up’ Obama’s comments on Clinton’s email Opposition leaders murdered in Honduras while US supports government McMullin scraps Virginia event to focus on Western states MORE's age when discussing when he might run for president. 

"Whether it’s two years, six years, 20 years from now, because at 47, I mean I think about Hillary Clinton, I could run 20 years from now for president and still be about the same age as the former secretary of State is right now," Walker said in an interview with the local Fox affiliate published Sunday night. 

The comments about Clinton, who is 67, came as Walker was discussing the toll of being president. 

“I say this only half-jokingly, that you have to be crazy to want to be president," Walker said. "Anyone who’s seen the pictures of this president or any of the former presidents can see the before and after, no matter how fit, no matter how young they are, they age pretty rapidly when you look at their hair and everything else involved with it."

Walker said last week that Clinton was the "biggest loser" in the midterms and that she embodies an "old, tired top-down approach from the government."

A range of possible Republican presidential candidates could use the strategy of portraying themselves as a new alternative in contrast to Clinton.

Louisiana Gov. Bobby Jindal, for example, previously told The New York Times that Democrats have "old, tired ideas being produced by old, tired candidates." 

Walker is coming off of a high-profile reelection victory over Democratic challenger Mary Burke. He has stoked presidential speculation by saying governors would make better presidents and telling NBC: "Not only do I care about this great state, I care about this country."

He was noncommittal in the local Fox interview, though, saying he thinks someone should run if "they feel called to."

“Right now, I still feel called to be governor of the state of Wisconsin," he said. "And I’m going to do the best job I can over the next four years.”