There's large variance there depending on demographic factors & income quintiles. Life expectancy is going up for some, while down for others:

https://fas.org/sgp/crs/misc/R44846.pdf

"Their most relevant finding for Social Security reform is that life expectancy increased continuously with income and that, according to them, “[t]here was no dividing line above or below which higher income was not associated with higher life expectancy.” At increasingly higher levels of income, they report that an increase in income of a given dollar amount produced positive but smaller gains in life expectancy. "