Both my parents are 60+. My mom is perfectly fine using Ubuntu on my old x61 for email, browsing, and YouTube. To be fair she could probably replace it with a tablet if it weren't for the fact that she visits a lot of flash sites (Chinese TV streaming sites). Likewise my dad is on another Ubuntu machine at home. His work needs access to some software / printers that can't be run via Wine so he's stuck with Windows th…
My dad's 60+ as well. I've had him use Ubuntu on an older laptop when his newer one was broken (several times now). He only uses music players & browsers (he uses stock trading websites, so needs java & flash plugins). He says he likes it but always goes back to Windows when he can.
You could be very cheeky and set the RedmondXP theme in XFCE4 just as a joke.