Nancy,
I know that my Dad and my Aunt are really learning to use their computers. I love being able to talk with them via e mail and send pictures. My Aunt, btw, does exercise and works in the schools which makes us kindred spirits. She is over 60 and deals with Lupus. We send health info back and forth. I have also given her workout vids. She has a Total gym and has added resistance as well as using her jump rope. I really don't think they join online groups, but maybe they just do not say so. I am sure it is harder for people that are older to grasp something that is natural for younger people.
Diane Sue