This election saw the highest turnout of any federal general election recorded by EAVS to date with 67.7% of the citizen voting age population casting ballots that were counted.
More than 209 million people were active registered voters for the 2020 general election and more than 161 million voters cast ballots that were counted for this election.
You know, I didn't confirm anything, but I will now. I'm glad you asked!
The US Census reported 168,300,000 registered voters in 2020. If you take 69% of those registered voters, you get 116,000,000 votes.
69% of registered voters or 69% of eligible voters turned out?
Only registered voters are allowed to vote (at least legally vote).
And voter turnout uses eligibility (by age, NOT registration) to calculate percentage.
The US Election Commission has these numbers
209 million registered 161 million votes.
https://www.eac.gov/news/2021/08/16/us-election-assistance-commission-releases-2020-election-administration-and-voting