Yes we have both exaggerated. It’s between 6 and 9 years for the numbers published in 2021 (an odd time). It likely does not include early symptoms occurring during that period preventing or limiting the things retired people would have generally expected to have been able to do in decades past. Since its a range it reduces some of the problems in identifying the mythical average person, but not entirely. Of course a great many people will fall outside of that range and decline much earlier, with some doing so much later. Etc etc etc.

None of this really matters though. People should be able to retire earlier like generations past, and slightly less death or sickness happening at a certain age is not a good reason to change the retirement age. It’s just governments who want to keep or give out tax cuts looking for ways to reduce services.