The Seattle Times discusses calorie restriction today, interviewing a range of practitioners along the way. As the article notes, calorie restriction is currently the only scientifically proven way to extend healthy lifespan. It provides additional health benefits beyond that, including weight loss and resistance to the common degenerative conditions of aging. It's certainly something that you should look into, and the CR Society is a good place to start. They're a friendly, helpful, active online community and the CR Society website provides access to a wealth of useful resources.