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Congratulations, you are almost perfect. Walking for 40 minutes 2-3 times each week and swimming 2-3 times each week would seem to be enough.  It isn't.  I would suggest only two more things, for muscle strengthing.  Get some 2-4 pound weights and start by standing (or sitting) with arms down and bend elbows up (to work biceps) 10 times; then repeat if easy. If really too easy increase weights to 5 lbs. Do this twice a week. Also add some abdominal curls twice weekly. Lie on your back, with your knees bent. Keep legs together and curl knees over your abdomen 8 times. Then lift head and shoulders off the ground 8 times. Don't do both at the same time!.

Please be guided by your good sense, advance and slow down as your body tells you. Thanks for asking Dr. Dixon. / GLD