But you assume with many, that it will kill you earlier than 9 years.This is the problem. You can't know. If you saw my father on his 80th birthday you would think he should have died at least 5 years earlier from his serious heart condition which he'd had for 25 years. He died at 82.
Very few 80+ year olds have no comorbidities as would be reported on a death certificate. This is the whole point, you can't think of comorbidities as stuff which is going to kill you tomorrow.
I believe the calc missleading as it wont have looked at the health of those who died and compared it with those who survived.
Another way of looking at it would be the high percentage that was in care homes, and im certain the average life expectancy of those in care homes isnt anywhere near 9 years.
In fact from my anecdotal experience i would be surprised if it was as high as 2 years.