I had the fortunate experience to learn about using Yoga for pain from a public television station, and thought I would share that information with you along with some websites, which provide information on Yoga for seniors (not that you have to be one to benefit from reducing pain with Yoga methodologies).
Below are links for websites which have information for Yoga that I think you will find useful.
Yoga for Seniors
Poses for Everyone
Seniors ♦ Yoga Challenge
30 day yoga challenge – https://www.doyogawithme.com/content/yoga-seniors
Click this link for pain free Yoga information.