On the other hand, the best anti-scam feature for older relatives is to tell them to "go there in person". Get a call from the bank, they simply tell them "ok, I'm coming to the bank tomorrow, in person", and they're done. Scam call? Legit call? Doesn't matter, they'll sort it out at the bank.

There's a whole wide age and knowledge/competence where older people can still fall for scams (or can't know if it's legit or a scam) but on the other hand are still capable to go to whatever office/bank they need to go.