Answer:75minutes
Explanation: World health organization ( WHO) and the United States Government recommends a 75minutes of vigorous-intensity aerobic exercise or physical activity for adults 65years and above. These activities include JOGGING,RACE-WALKING, SWIMMING,ROPE-JUMPING, RUNNING etc this is to keep them healthy as most are out of regular work. These activities will help them to be able to prevent CARDIAC DISEASE, DIABETES,STROKE etc.