Being a senior citizen I can speak from that viewpoint(though not for all) I am in my seventies. I don't believe that I would have any difficulty changing systems, but would not really want to if the one that I had was working satisfactorly. I would prefer to update within the same system(XP to 7 etc.). I use my desk computer a lot(I also have a laptop that I don't use as much) but most of the things that I do are not very complicated(word processor, CD copier, storage files) If something seems difficult, sometimes, I won't fool with it. I play some computer games, I look up things, I go into forums. I think many senior citizens use their computers in a somewhat like manner. Having said that, if one of my children gave me a computer with linux, or a Mac, I certainly wouldn't be mad at them.