Exercise for those 75 and older seems to make good sense, and now there is proof that the activity is beneficial. Dariush Mozaffarian, M.D., Dr.P.H. and his colleagues at Tufts University carried out a 10 year study about exercise behaviors of over 4,000 people with an average age of 73. The research revealed that those who walked faster than 3 mph had a 50% lower risk of coronary heart disease (CHD) and a 53% lower risk of stroke than those who walked slower than 2 mph. Participants who walked seven blocks each day had a 36% decreased risk of CHD and 54% lower risk of stroke than those who walked 5 blocks or less each week.