I'm 66 and overweight (180#) and I began runnng on the treadmill about 9 months ago. In addition to dropping 20 lbs., I ran my first 5K on St. Patrick's day and just ran a Color Run this past Saturday. Below is a link to a story that my insurance company did about me. I hope it can be inspiring to you in your quest to be a runner. I don't run for anyone but myself. Running is my therapy, and running a 5K was one of the things on my 'bucket list' but now I'm hooked on running.
http://www.healthwaysfit.com/article/silversneakers-member-success-story-ginny-yingst
Ginny