Jackson Free Press

WASHINGTON (AP) — Top Republicans coping with a razor-thin majority in the Senate as they try pushing a partisan agenda are running smack into another complication—the sheer age and health issues of some senators.

One of those ailing senators—79-year-old Thad Cochran of Mississippi—was back in Washington Tuesday after a month of treatment at home. A statement said he still had urological issues and his treatment "could affect his work schedule." A day earlier, aides had said Cochran would return to the Senate "when his health permits."

Cochran's prolonged absence underscores the challenges of navigating the second-oldest Senate ever. Without him, party leaders could afford just one Republican defector on a pivotal budget vote this week, and the Appropriations Committee that Cochran chairs hasn't churned out any spending bills for next year since he was last in Washington in mid-September.

Cochran isn't the only GOP senator with health issues that have caused them to miss time this year in Washington. In July, the Senate delayed votes for a week on repealing President Barack Obama's health care law after Sen. John McCain of Arizona, now 81, was diagnosed with brain cancer. And Georgia Sen. Johnny Isakson, 72, was away for two back surgeries early in 2017, two years after being diagnosed with Parkinson's disease, a degenerative neurological condition.

In addition, a pair of 80-somethings are up for re-election in 2018, one from each party. They're among 16 senators facing re-election who come Election Day 2018 will be at least 65 — an age when many people have already retired.

Sen. Orrin Hatch, R-Utah, 83, hasn't announced a final decision on whether he'll seek an eighth, six-year term next year. On the Democratic side, California's Dianne Feinstein — at 84 the oldest current senator — has announced she will run again next November. If re-elected, she could serve till she's 91 — an age reached by only four other senators while in office.

"The ability to get things done counts. And the compassion, vigor, and stamina to make a difference counts," she said last week, as if pre-emptively fending off questions about her age.

That didn't stop 50-year-old Kevin De Leon, president pro tem of the California state Senate, who announced on Sunday his Democratic primary challenge to Feinstein.

Sen. Mazie Hirono, D-Hawaii, who turns 70 in November, was diagnosed with kidney cancer this year but has said she'll seek re-election next November. Also facing re-election are at least three other cancer survivors: Sens. Claire McCaskill, D-Mo., Bill Nelson, D-Fla., and Angus King, I-Maine.

Overall, senators averaged 61.8 years old when the current two-year Congress began in January, according to the Senate Historical Office. That's tied for second oldest with the Senate that began in 2007. That was surpassed only by the two-year session that began in 2009, when senators averaged 62.7 years of age.

Right now, the chamber has seven senators at least 80 years old — excluding Cochran, who reaches that age in December. Seventeen are in their 70s and another 40 are in their 60s. The youngest senator, Arkansas Republican Tom Cotton, turned 40 in May.

Of the nearly 2,000 people who have served as senators, just 42 were still in office at age 80, according to the historical office. The oldest: Sen. Strom Thurmond, R-S.C., who left office at age 100 in 2003, six months before he died.

The average age of senators was in the mid- to late 40s during the earliest Congresses. It's fluctuated but gradually risen since then, in part tracking a steady increase in life expectancy in the U.S. It also reflects a political reality — voters usually like to re-elect incumbents because they value them, so senators are serving longer.

"Most voters at one time or another say they wished senators would serve a term or two and get out," said Larry Sabato, who directs the University of Virginia's Center for Politics. But when it comes to their own senator they feel, "'Seniority is really valuable, we don't want to lose that,'" he said.

This week, GOP leaders aim to push a budget through the Senate that would lay the groundwork for the chamber to approve huge tax cuts later this year. With a 52-48 majority, Republicans can normally afford just two defections and still approve legislation because Vice President Mike Pence can cast tie-breaking votes.

If Cochran stayed away, the budget would fail if more than one GOP senator votes "no."

On Monday, chief of staff Brad White said in a statement that Cochran has a urinary tract infection and was remaining in Mississippi "on the advice of his physicians and other health care professionals."