I agree with the sentiment, but I think it's implied in these discussions that they are looking for healthy longevity, not lying in bed unable to take care of o

I agree with the sentiment, but I think it's implied in these discussions that they are looking for healthy longevity, not lying in bed unable to take care of oneself for an extra 10 years. It's even in OP's question that they started this research after noticing mental decline so one can reasonably conclude they are looking to halt or reverse the effects.