The 118th Congress features oldest legislators on Capital Hill in the past century.

According to analysis from NBC News, the Senate has an average age that is the second oldest in United States history, with the House's average being the third oldest.

Since the early 1980s, the Senate has aged by twelve years, with the House aging by nine. In comparison, the median age in the US has increased by around nine years.

As of the swearing in of new lawmakers Tuesday, the average age in the Senate is 63.9 years, and 57.5 years in the House. The U.S. Census Bureau reports that the median age is 38.8 years old. According to NPR, only 5 percent of lawmakers are average age or younger.

Senators must be at least 30 years of age when sworn in to office, with House representatives having a minimum age requirement of 25. There is no maximum age limit.

The youngest House member is Florida Democrat Maxwell Alejandro Frost, who is 25, with the oldest being California Democrat Grace Napolitano, who is 86. In the Senate, Georgia Democrat Jon Ossoff (35) is the youngest, with California Democrat Dianne Feinstein (89) as the oldest.

In a survey by Insider, 41 percent of respondents said that the ages of political leaders are a "major problem." Another 37 percent said it was a "minor problem." 75 percent were in favor of a maximum age for members of Congress.

Senior data editor at Insider Walt Hickey previously told NPR that the maximum age restriction is "on par with the number of people who want maximum ages for police officers and pilots."

"We found that this kind of held across parties, and we found that it actually held across age groups," Hickey explained, adding, "This is something that people really care about."