The Do Yoga With Me Youtube channel has an hour-long chair yoga video for seniors that emphasizes arm and wrist strengthening but includes some stretches and some leg and ankle strengthening. I do it standing and add a bit of weights to some of the activities. They also have a 23-minute "Yoga with Ron Stewart: Morning Wake Up and Move!" video that I've liked.
Yoga with Adriene has many wonderful videos, including this 40-minute Vinyasa for strength:
Full Length Gentle Yoga Class for Beginners and Seniors, parts 1, 2, and 3, from The Mat Project:
Those videos above are not a sequence but are separate routines that can be practiced independently of one another. The second one is perhaps a bit more advanced.
Yoga with Tim has a 1-hour class:
Yogasync.tv has a video with clear instruction for 20 postures:
Melissa West spends a lot more time talking before she starts the actual yoga poses to suit me, but I like some of her videos.