Perhaps, but also understand that cognitive decline is often an accelerating process. If they were in their mid/late 60s in 2011, they could be 80 today. It is not out of the realm of possibility that a person who was able to grok bitcoin in 2011, may be unable to resist a scam today.

Of course, we don't know the details here, but I do see it as a possibility, albeit one where the person should have taken steps to protect themselves - however that is the devious nature of cognitive decline, innit.