WASHINGTON - A poll finds that a growing share of U.S. adults doubt that 81-year-old President Joe Biden has the memory and acuity for the job, turning his coming State of the Union address into something of a real-time audition for a second term.

Roughly 6 in 10 say they’re not very or not at all confident in Biden’s mental capability to serve effectively as president, according to a new survey by The Associated Press-NORC Center for Public Affairs Research. That’s a slight increase from January 2022, when about half of those polled expressed similar concerns.

By the same token, nearly 6 in 10 also say they lack confidence in the mental capability of former President Donald Trump, the 77-year-old Republican front-runner.

For many voters, this year’s election looks like a showdown for the world’s toughest job between two men who are well beyond the standard retirement age. The next president will probably need to steer through global conflicts, fix domestic emergencies and work with a dysfunctional Congress.

Biden is likely to address those challenges and more in his State of the Union address on Thursday as he tries to convince Americans that he deserves another term.

Going into the big event, just 38% of U.S. adults approve of how Biden is handling his job as president, while 61% disapprove. Democrats (74%) are much likelier than independents (20%) and Republicans (6%) to favor his performance. But there’s broad discontent on the way Biden is handling a variety of issues, including the economy, immigration and foreign policy.

About 4 in 10 Americans approve of the way Biden is handling each of these issues: health care, climate change, abortion policy and the conflict between Russia and Ukraine. But people are less satisfied by Biden’s handling of immigration (29%), the conflict between the Israelis and the Palestinians (31%) and the economy (34%) - all of which are likely to come up in the speech before a joint session of Congress.

Nearly 6 in 10 (57%) Americans think the national economy is somewhat or much worse off than before Biden took office in 2021. Only 3 in 10 adults say it’s better under his leadership. Still, people are more optimistic about the state of their own bank accounts: 54% say their personal finances are good.

Many respondents to the survey were deeply pessimistic about their likely choices in November because of age and the risk of cognitive decline.

Paul Miller, himself 84, said Biden is just too old - and so is Trump.

“He doesn’t seem to have the mental whatever to be a president,” Miller said of Biden. He added that Trump is “too old, too, and half crazy.”

The retiree from Carlisle, Pennsylvania, said he voted for Trump in 2020 but he wouldn’t do so again.

“I don’t think I’m going to vote for either one of them,” he said. “I hope somebody else is available.”

About one-third of Democrats said they’re not very or not at all confident in Biden’s mental capability in the new survey, up from 14% in January 2022. Only 40% of Democrats said they’re extremely or very confident in Biden’s mental abilities, with approximately 3 in 10 saying they’re “somewhat” confident.

And in a major risk for Biden, independents are much more likely to say that they lack confidence in his mental abilities (80%) compared with Trump’s (56%).