Have just spent a couple of days with my trim 84 year old mother and her slim childhood friend also 84. We took them walking, all kitted out properly in hiking boots, and they happily walked and chatted for a 3 mile woodland walk, stopping only for our sandwiches in a lovely riverside spot. Not only did they manage the 3 miles which included 2 hills, they climbed about 5 stiles of various heights and sizes (with a helping hand of course) too!
My mother eats very sensibly, she has reared 5 children and had a serious heart operation some 5 years or so ago. She is a fine example of someone who lives with her cup half full! She could never have enjoyed such a day out if she was overweight and unfit - I do so want to be like her when I grow up (or perhaps I should say get old)!