Healthspan refers to the amount of years a person lives while retaining good health and physical mobility. Living to 100 and beyond should not be your goal if the last 30 of those years have you bedridden and dependent upon others. Whether you live to be 80 or 120, you want every month of every year filled with good health and the ability to live life fully and without being dependent upon others.
Physical exercise and sensible nutrition are necessary to achieve that extended "healthspan."
Live like a lion, or die like a lamb . . . your choice.