ECG while resting is not a garuntee of good health. Stress ECG whie on trade mil is a good indicator of cardio vascular conditions. Internal inflamation is now recognised as major factor for heart attack. C reactive protine is an indicator of that. Some other biochemical tests like Cholestarol, triglycerides, GTT also non invasive MRI is now available for the heart. Age alone is not a factor. Anyone beyond 45 years life style and general fitness plays a large part in longivity. Exceptions will always be thhere. Those are not the criteria. Indian medical requires lot many tests beyond 60 years.