For example, "you're only as young as you feel."How one feels is not merely a matter of optimism or wishful thinking, it's far more likely to be an objective indicator of good... moreFor example, "you're only as young as you feel."How one feels is not merely a matter of optimism or wishful thinking, it's far more likely to be an objective indicator of good health.Research shows that people's chronological age is often very different to their real physical age.A fit sixty-year-old can have the bone density, heart-rate and energy of a forty-year-old,while an obese forty-year-old can have diabetes, high blood pressure and heart disease.