The United Nations World Population Prospects suggests current life expectancy in Australia in 2022 to be 83.79.
In fact, Australia enjoys one of the highest life expectancies in the world, ranking 8th out of 60 developed countries. That’s higher than the UK (81.65) and the US (79.05).
[ raw data source ] https://population.un.org/wpp/
So it appears that both Australia and the UK with National Health services (named differently in AU) have greater life expectancies than the US.
Perhaps it's the authors you read?
Bertrand Russell was 97 when he died.