The longest life expectancies is about 86 years for Japanese women. This is almost as good as a 10% reduction in medically preventable conditions versus an 80 year life expectancy, which would result in 88 year life expectancies.
There are many causes of death, so it would take a lot of new technology to eliminate or mitigate each one or each category.
Conditions can be improved to reduce deaths. Air pollution can be reduced and water quality can be improved.