Like all of our clients, the elderly ones come to us with a wide-variety of capabilities and limitations. I try to treat each older person that I work with as an individual. That being said, I think that the methodology that I use to work on each elderly client’s balance is as varied as they are. You can go from the very simple (e.g. standing and simply shifting from one foot to the other) to the more complex (e.g. single leg stand with a ‘star pattern’ with the free leg, or even uneven surface work such as wobble board).
Safety first should be the mantra of working with the elderly on balance, BUT don’t be afraid to give them a challenge as well.
I hope that this helps. Good luck!