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Why don’t you think medical care is a big factor? Do you have any logical reason or data to back that claim up? If what you think is right and family care is more important factor, then life expectancy would have been way higher in the past (which it wasn’t). Moreover countries like Bangladesh would be high in the life expectancy chart along with Singapore.

What I mean is that it's not the biggest differentiator among developed countries. Not talking about developing vs developed countries here. Basically what makes you an outlier in terms of longevity is not medical care.

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