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Just extrapolate what elderly (90+) contribute to society now. Before even thinking about longevity, we need to eradicate degenerative diseases that make old people useless in society - Parkinson's, Alzheimer's, Dementia, Arthritis, ...

There would also be a necessity to allow (and even force) euthanasia for people in persistent vegetative state.

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Longevity is not about keeping people with dementia alive indefinitely, it is about repairing damage caused by aging, before that can cause degenerative diseases, cancer, etc.

Most of the diseases you’re describing are associated with ageing, if you can treat ageing their prevalence would likely be vastly reduced; not to mention that there wouldn’t really be a concept of “elderly” anymore, just people who’ve been alive longer.

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