The metric of “living longer” isn’t the same as “life expectancy once you reach the age of 65”, for example. In the US, when someone cites a statistic that our average life span decreased, it’s due to the effects of early-life mortality on the mean. If you make it past 65, it’s a different statistic.

there is not one USA with respect to these things.. "all people" did not stop living more than 65 years recently