I suppose I was lucky because at college a lot of our models were elderly, and now I am working with the elderly cutting their toe nails. The stories they can tell really open your eyes.
Just treat them like normal clients which is what they are it is just that they have seen and done far more than us.
Do a normal consultation check for any contraindications just as you would on any paying client, if everything is ok do your normal routine but be gentle, their skin is a lot thinner because of their age, a lot of the clients we had, loved the warm wax treatments, and heated mitts, because it is soothing. If worried miss out the exfoliation all together and if massaging (which elderly people love) just do it gently. Tailor your treatment to their needs, and they will come back bringing their friends with them. Just think we are all getting older, would you not like to be pampered when in your twilight years I am sure you would, so why wouldn't the elderly of today, a nice chat while having their nails done is the highlight of their week, especially for the ones with no family. So go on Make Someones Day Special.
Joan