I have no doubt that improving our diet and health habits can add time to our lifespan.
Most of us are too lazy or obstinate to try it - (probably including me, in many ways :-)
in this present world, how long really do we want to live?.....seriously....
My hubby would be on your list too. He is a meat and potatoes guy. He’s 73, and recovering from Covid, colon cancer removal, and chemo. Fatigue is his biggest battle.
He would never do smoothies, any green vegetables except green beans and peas. They kept asking during chemo, any nausea? In 53, nearly 54 yrs married, I’ve known him to be nauseous maybe once.