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How Long. For walking, bike riding or other moderate exercise -- rigorous enough so that it's hard but not impossible to talk -- seniors should slowly build up to 30-minute workouts. And if 30 minutes all at once is impossible, two 15-minute sessions or three 10-minute workouts are fine.
While you should always stick with a cardio program that fits with your fitness level, the general guidelines for cardio exercise include: 1  For health benefits, do moderately intense cardio 30 minutes a day, five days a week OR vigorous cardio 20 minutes a day, three days a week. For weight loss, you may need to do 60 to 90 minutes of activity several days a week.