Hi Trevor.Thank you.Good to hear that you are back.Keeping up the running I trust.I can't power walk now but I do 2 miles every morning on a cross trainer.
The instruction book with it recommends workouts for maintaing fitness in the elderly range - 80 to 90 age - as 4 miles a day.
They don't give for over 90 age, which is a bit unsettling.It also misses a great plug for their machine's ability to prolong activity, and feature in The Guinness Book of World Records!