According to a Harvard University study of 2,357 males in their 70's for 25 years, just doing five things gave participants a 53% chance of living into their 90's. Those five things were:

1. not smoking
2. maintaining a normal weight
3. exercising regularly
4. having a low blood sugar
5. having a low blood pressure

The good news is that #'s 1-3 are doable for most people. And doing #'s 1-3 really impacts #'s 4 and 5.

(Dr. Laurel Yates and colleagues, Harvard University. Published in Archives of INternal Medicine, 2008.)