Life expectancy also takes into account infant mortality and young deaths - if overall life expectancy is 84, and you’re already 68, you would likely make it longer than 84 since you already didn’t die for the first 68 years.
As an example, in the US life expectancy at age 0 is 74 years, but by the time you’re 30 it’s up to 77 years. By the time you’re 60, it’s up to 80 years.
Life expectancy also takes into account infant mortality and young deaths - if overall life expectancy is 84, and you’re already 68, you would likely make it longer than 84 since you already didn’t die for the first 68 years.
As an example, in the US life expectancy at age 0 is 74 years, but by the time you’re 30 it’s up to 77 years. By the time you’re 60, it’s up to 80 years.