We all want to live longer so that we can enjoy more life and experience more things. And good thing is that we can do this. New US research has found that your physiological age, which is how well you respond to exercise, maybe a better predictor of life expectancy than your chronological, actual age.

Research carried out by researchers at the Cleveland Clinic, the new large-scale study looked at 126,356 patients with an average of 53.5 years who were referred to the clinic for their first exercise stress test, a common exam which diagnoses heart problems.

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Patients walk on a treadmill, which gets more difficult throughout the exam, and have their exercise capacity, heart rate response to exercise, and heart rate recovery measured during test.  The researchers then developed a formula which calculates how well people respond to exercise -- their "physiological age" -using this data, which they call the A-BEST (Age Based on Exercise Stress Testing). They also took into account gender and any medications that affect heart rate.

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According to the study, after an average follow-up of 8.7 years, the A-BEST was a significantly better predictor of mortality than chronological age, even after taking into account sex, smoking, body mass index, statin use, diabetes, hypertension, coronary artery disease, and end-stage kidney disease.