My parents are a little older but I got them both Moto g whatevers around 5 plus years ago.
Fortunately they mainly got it so are both now using more up to date Moto G whatevers.
I have done a fair bit of support however, which I think is inevitable. It's a real shame that technology doesn't seem to consider older generations.
I do think android is a good option if you're prepared to help as it's so customisable. Namely with:
- Initial set up - I.e. just getting the phone up and running
- customisation I.e. removing unwanted apps / putting apps on the homescreen etc / enlarging fonts / changing synch options
I've found the cheap to mid range Motos very good for my parents and my mum particularly likes / appreciates the big screen.