I think that's pretty good policy across the board. Short useless story - my dad is 73. He trusts computers and phones for nothing and refuses to get anywhere close to even looking at his bank account online.
He's also naive.
A couple of months ago, he called me and told me that his computer had a problem and some guy wanted to charge him $299 to fix it, and a number popped up. He didn't immediately let the guy onto his PC but called the number. I mentioned to him to stay away as the next thing that guy would do is log on to his computer and start searching for anything of value that he could find, and would leave a keylogger.
At that point, my dad admitted that he'd already allowed the guy onto his computer. I told him to immediately notify the bank and anyone else he's ever accessed on the PC. He disregarded this suggestion (still thinking the guy was a "real" tech service person) and continued to complain about $299 and described berating the "customer service agent" about how terrible the price was. The computer became a paperweight, but he stayed on the phone berating the guy about the price having no clue the guy was looking for much more.
I told him to find a local computer service brick and mortar and get his computer cleaned, and reiterated that he could have issues. He had none because he doesn't use a computer to do anything other than check email and read sports scores and sports recruiting information. I wouldn't normally believe this, but I've been on his PC before and the browsing history has about 6 links in it ( and literally nothing on the desktop or anywhere else. he wouldn't know how to save a file, anyway).
What saved him? Certainly not savvy. What saved him was the fact that he still will not do any banking unless he's talking to a person or writing a paper check. A CPA does his taxes, so nothing of value done digitally.
I'd say if you want to be safe from your phone, no banking from your phone no matter what, etc, and no saved password function (doesn't matter if you don't do banking from the phone if google shares settings and autocompletes passwords). Perhaps some of this has been solved now by banks requiring two-factor authentication from a separate device. I don't know.
Many older people (and younger) store a file with sites and logins and passwords, as well as digital records on their phones and PCs. They're sitting ducks. Once a scammer gets on a device or PC of yours, they sell your name/phone/IP address, etc as an easy target.