it is difficult to assess life expectancy - it depends upon 1) ejection fraction
of heart 2) how much dilation of cardiac chambers 3) what arrhythmia
and their frequency 4) any valve regurgitation 5) renal dysfunction
or not 6) response of medicines .
you should continue your physical activity as much u can without exertion , take medicines properly and remain happy ( as depression
will exaggerate your problem)