Under-rated problem. The decline is real, and towards the end of their life many people end up handing a power of attorney to their children or other close relative in order to run their lives. While in the meantime there are so many more internet-enabled scams.
I've also got elderly relatives, and even with their pensions secure (European-style pension system), there's lots of people going after their money. Trying to prepare them for encounters with online and real world scammers is an ongoing process, e.g. by recounting the cases that I read in the news to foster mistrust.
I've lost count how often an elderly family member (who is still sharp as a tack fortunately) told me that the "police", "your beloved niece", or "Microsoft" called them.