You are as old as you think you are. Studies have shown that we typically perceive ourselves to be from 7 years to 20% younger than our actual chronological age.  This gap is called our subjective age, but are we just living in denial or is there a benefit to this kind of thinking?  Preconceived notions that we each hold on aging may also be a predictor of our eventual, future reality. People who perceive themselves to be younger than they are typically lead healthier lifestyles, engage in more positive self-talk and self-care, and tend to be less depressed.