As far as financial scams go, my parents and uncles handled my grandparents’ finances for their last decade. If they were targeted then there would be an upper limit to how much money they could lose in one scam. They also weren’t paying for things online.

As for younger elderly people, if they’re still smart enough for it then I’d try educating them. Practically, not just talking about it. There are plenty of good public interactive resources for phishing training, so I’d be surprised if there weren’t any for AI. Also simple things like “never pay for anything in gift cards, ever” are some easy wins.