As my girlfriend tends to her hospitalized mother, I reflect on the benefit of yoga for all ages.  At age 94, she fell down and wasn’t found for 24+ hours. She’s rehabbing now, relearning how to stand up from a seated position. 
My mother works on her strength and balance so that she can continue to live alone at home unassisted. With her physical therapist, she is improving.  In our classes, we always work toward independent living throughout the lifespan, in these most rudimentary ways.
If you fell down, could you get back up? From a seated position, are you able to simply stand back on your own 2 feet without assistance? Ki to Happiness keeps her strength and balance as she grows into her elder years with Hatha Yoga.