Probably the four most important things you can do to change your odds of making it past 80 are:

    1. Not smoking.
    2. Eating healthily (fiber, vitamins, low sugar; this is a nascent field).
    3. Exercising regularly.
    4. Wearing sunscreen and minimizing sun exposure.

These will collectively reduce your risk of common cancers significantly, as well as protect against heart disease. Additionally, they can help strengthen your immune system and body against other diseases that e.g. the malnourished or obese would be more likely to succumb to.