The bulk of the audience was 55 and over: 34.2 million.
An estimated 10.9 million were 25-54, and 4.5 million were 18-34.
Holocaust Museum’s Board
CNN drew 9.53 million viewers during the debate itself.
Donald Trump and Joe Biden in the CNN studio at the presidential debate on Thursday.Justin Sullivan/Getty Images
The audience also was way below the first Trump-Clinton debate in 2016, when 84 million tuned in.
Previous general election debates have taken place in the fall, when viewership is traditionally higher.
Of those 18-34, just 3.92 million watched.
CNN itself saw viewership of 8.7 million, edged out by Fox News simulcast with 8.8 million.
ABC News drew about 8.7 million to its feed of the event.
MSNBCs simulcast, meanwhile, drew 3.97 million.
The web connection said that the debate was its largest livestreamed event in history.
