I have to disagreed with you, Xuan. I have found that people live longer and can support themselves when they are independent, sellf supporting and living on their own.
When you have to get out of that chair and fix your own food, wash your clothes, and clean your house, you are expressing an independence. It's not like you have someone else doing these things for you. You are not motivated to do anything. Everything is done for you which would make anybody seditary and emmobile. You become inactive and your bones will easily break from inactivity.
I have watched my parents and several other elderly citizens who are very active beyond their retirement years. The ones who lived alone or with their partners lived very active lives. Look at the ones who are able to travel on their own. They are very active in the community and going all the time. My parents-in-laws moved to Florida and still living in a very active community. They are not in a rest home taking it easy.
Some of the people I work with are any where 20 to 25 years older than me. They are actively still working 40 hours jobs and they may stop working whenever they feel like it. There are judges still on the bench who are over 90+ and still actively working their schedules.
I truly believe that the good people in nursing homes were hard working people who didn't take care of their health when they were younger.