New research reveals longevity gains slowing, life expectancy of 100 unlikely

Is it just genetic? On my father’s side, people typically live to 100 at a minimum and are perfectly healthy mentally and physically right up till a week or so before they die. My grandmother is 103 and can still lives alone in her house and can walk unassisted, has a memory sharp as anything, and so on. Maybe look at long lived families and figure out what is different about them?

Maybe living the blue zone [1] lifestyle?

[1] https://en.m.wikipedia.org/wiki/Blue_zone