I moved my parents (in their 80s) to Linux Mint when their XP computer died.
How long ago was this and which version of Mint and have you updated it to the latest release of Mint since? I ask, as your comment and variations upon it have frequently been made on El Reg. Whilst a move to Linux does get you off the MS driven upgrade treadmill, I'm not so sure a move to Linux xyz actually gets you off the upgrade treadmill and liberates you from the whims of those who think every new release should have a UI makeover.