Tend to be healthier to begin with, meaning that as you get older, you aren't getting sicker, you just keep on living with more of the same level of general health.
Come from a range of backgrounds. The number of years spent in school, how rich or poor they are, or what they eat (from fatty food-aholics to vegetarians) are not important factors.
Are lean and fit. Few overweight people live to be 100.
Don't smoke.
Are good at handling stress. Centenarians may have gone through difficult times just like everyone else but they seem to be able to let go, adapt, and move on more easily.
Report being less tense and higher in self-confidence, as well having optimistic attitudes and an easy-going approach to life.
Have longevity in their genes meaning that family members are more likely to live longer as well.
Still have normal thinking abilities and do not suffer from degradation brought about by illnesses such as Alzheimer's disease.
Exercise - About 30 minutes per day of any activity that gets you off your cozy couch, including walking, running, lifting weights, etc.
5 Servings of Fruits and Vegetables - This one is two-fold: Not only will the addition of more fruits and vegetables provide you with several important vitamins and minerals, it should also keep you fuller between meals, thus reducing your Dorito habit.
Toast to Alcohol - Careful, this isn't an excuse for you to feel good about the entire 40 oz. you just downed. Moderate drinking in this case was considered to be 1-14 glasses of wine or beers per week.
Quit Smoking - This one is pretty self-explanatory, and if it applies to you, you clearly aren't concerned with living a long, healthy life anyway.