[hatch_q]

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.

[chr1]

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.

[andrewingram]

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.