Hey, 65 isn't THAT old...
LOL! Really, in today's society, women who are 65 are usually not ready for the ole rockin' chair on the front porch yet. Your grandmother's age is not the key in how successfully she'll make the transition to a Mac, it's other elements which come into play. 65 is not too old to learn something new.... heck, my 94-year-old mother got her first (Windows) computer last Christmas and did just great with it! If she were still here now (RIP) I'd be steering her into a Mac so quick her head would spin....
I'm 60 and I just made the big switch to Mac a couple of weeks ago and found it to be an extraordinarily painless and pleasant process. Setting up my new iMac and new PB was nothing like setting up a new Windoze PC or laptop! I am already recommending Macs to everyone I know who is still wrestling with Windoze. True, I'm pretty computer-literate, have been using them at work and at home since the early 1980s so maybe that makes some difference, but nonethless, even if your grandmother has had problems and frustrations with Windows in the past she'll quickly catch on to Tiger OS X and the whole Mac way of doing things. the Mac is so much, much easier and more intuitive than any Windows machine! People have offered great suggestions in this thread to get her excited about a Mac and I hope that one of these days we'll be hearing how much she loves her new Mac!
OTB