I am glad you are doing well. Interesting. I have been hearing people telling me to slow down for at least 20 years now. I do not share my exercise routine with people who don't work out...even most who do work out...I guess I have been doing just like you...listening to my body...once back in 1983 I felt heart pain for a few seconds and stopped running immediately...scared me. I absolutely don't feel I have any less energy than when I was 20 years old... I just see so many people around my age who have very little energy and are ready to retire...I always wonder in the back of my mind when will I slow down and what will cause it?