The Spotlight on President Biden’s Age and Mental Fitness

The swirling questions about President Biden’s age and mental fitness for office have captured Americans’ attention.

Television Audience Tune-in for Biden’s News Conference

More than 23 million people — a bigger audience than this year’s Academy Awards — tuned in on Thursday evening to see how Mr. Biden handled his first live news conference since a poor performance at last month’s debate with former President Donald J. Trump.

Viewership Statistics

• The television audience amounted to roughly 45 percent of the 51.3 million who watched the debate, according to Nielsen.
• The president’s nearly hourlong appearance, at the NATO summit in Washington, was one of the most-watched telecasts of the year, outside of sporting events.
• Fox News attracted the largest audience of any network, 5.7 million, representing nearly a quarter of the overall television viewership.
• ABC was the highest-rated broadcaster, with five million viewers, possibly benefiting from a lead-in from “Jeopardy!,” the game show that aired immediately before Mr. Biden’s news conference.

Demographics of Viewers

Roughly four of five viewers were 55 or older, Nielsen said. ABC drew the largest audience among adults 25 to 54, the key demographic for advertisers in cable news.

Comparison to Previous Interviews

Compared to his predecessors, Mr. Biden rarely grants solo news conferences, which added to the novelty of Thursday’s event. Mr. Biden’s interview with George Stephanopoulos, which aired last Friday on ABC, was seen by 8.5 million viewers.