If you ask around, you can find a therapist that specializes in the elder population. Pretty much any massage therapist who knows their stuff will be able to provide, though. I read an article recently where an Alzheimer's patient who received massage started to talk to people again, and came to recognize her therapist after some months. If you can't afford a therapist, do a little research on geriatic massage or talk to someone in the field, and they can show you some basics strokes that you can do. The important part is you keep it light, and usually brief. In the meantime, just remember sitting and holding hands with your elder, or things like brushing their hair, can do a lot of good for them.