Happy Birthday, Clock! (((HUGS))) about the knee. If you do still intend to run and get an all clear from health professionals to, my friends love Chi Running. The book drove me batty reading it, but it has some very good pointers for keeping the impact on knees low. My trainer during a course on adapted sports is 75 years old and he still runs an hour every day, so running is definitely not only for the young (or uninjured!)