Here is more research supporting the benefits to be obtained from starting the practice of calorie restriction at any time in life. You'll benefit more if you practice longer, but there are always benefits to be gained by starting now: "Recent studies on the effects of dietary restriction (DR) in rodents and primates have shown that even late-onset short-term regimens can bring about comparable beneficial changes seen in animals subjected to life-long DR. We examined the effect of 3 months of DR on the expression of antioxidant enzymes and antioxidants, [and more] in 18-month-old middle-aged rats. The present study shows that DR initiated in late adulthood confers beneficial effects, such as attenuation of oxidative stress [and more]." The closer scientists look at the biology of calorie restriction, the more they find in the way of specific biochemical benefits, and a slowing of age-related decline in specific cellular processes. It's well worth your time to find out more about calorie restriction for humans if you haven't yet done so.