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I'm not so sure those are the only two. I'm fairly certain high dietary intake of various vegetables, fruits, and legumes over processed foods would probably greatly add to the life expectancy of regular people. Don't have a lot of hard evidence but I have relatives who outlived their brothers and sisters by 10-20 years because they just ate significantly healthier and moved around more.

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Healthy diet keeps you healthy, but it does not slow aging. It prevents death from reasons other than aging.

To prove "slowing aging", you need to demonstrate increase in maximum lifespan, not average lifespan. Exercise, diet, etc. increase average lifespan. There is no evidence they increase maximum lifespan, none at all.

"Moving around more" actually does significantly lower your risk of death from cardiovascular events (at the very least). http://healthland.time.com/2013/12/19/how-many-steps-does-it...

Common sense, while harder to study in a lab than a new specific medicine XYZ, actually can serve us well in the messy real world.

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