alt Hacker NewsWell, the annual death rate is roughly 1 in every 100 and paychecks are every 2 weeks, the death rate every 2 weeks is 4 bps. So 99.96% of Americans live paycheck to paycheck.
But otherwise I think Matt Darling has a piece on Slow Boring that should help inform you as to the state of the US.
The phrase "live paycheck to paycheck" means "To spend all that one earns without saving anything", not the literal interpretation of "failing to die between paychecks" that you seem to be using here.
(IIRC, 60-70% is based on surveys, that percentage of people feel they're living like that, but actual stats are much lower, like 25% or so, but it's important to make sure the same thing is being discussed when having conversations like this).