I think when you get to your age group John you can pretty much write your own rules, what works for one may not work for another. How long have you been running?
I must say you should be proud of yourself, relatively few people your age spend their time running and a lot of people your age wouldn't be fit enough to even try. There's also a large amount of fat lazy people in this country and most of them do not have the excuse of old age to fallback on. 55min is a good 10k time so I'd say you must be doing something right 
Welcome to the forum and I hope you can share your experiences with us.