My Mom is 68, last year I bought her a 20" iMac and since then she has convinced two of her elderly friends to get them too. She absolutely loves it!
The funniest thing was the day I got her the iMac we set it up and I explained to her about her "Windows" programs not being able to run on it. The next morning she's telling me all about Fusion, Bootcamp and Parallels. Saying I was wrong, you could run those Windows programs with any of these!