One of the basic ideas that is mentioned as a reason why people live so long and healthfully in the Blue Zones is what you're saying, Jay.
You have to have a reason to wake up in the morning. Something that makes you happy, that makes you feel like you make a difference, like your life has meaning. For some that's a spiritual or religious experience. For others, it's a service activity, like helping the poor or people who are in institutions. For some, it's making a type of art that makes them happy, their grandchildren, their group of friends who they hang out with. It could be a lot of things, but you need to have a reason why your life has meaning. In the US, the average life expectancy has decreased for the last 3 years, largely attributed to deaths of despair. People feel like there is no point to their life. They aren't connected to others in a way that makes life better. Yes, nutrition and exercise are important. But they aren't the whole thing.