The prescription in Lights Out is pretty damn close to optimal IMO. Periods of the year at or near ketosis. Some moderate intermittent fasting will accentuate the low carb approach. Pretty much seconding what Greg, Neal and others have said.
I think the point of influencing probabilities is spot on. You never really know what the outcome is but you can certainly influence some parameters. Cases like Uncle Fred who smoke, drank and lived to 90 just tells us there is enormous variability from person to person.
The schedule might look like: 3-4 months classic Crossfit programming. 8-9 months of strength work, hikes, 1 hard met once per week, perhaps 1 easier session.
I think the ketosis and intermittent fasting MIGHT extend life, maybe not. I'm pretty certain a lifestyle like the above will ensure some very high quality of life.
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."