I know this is a tangent to your comment but after seeing my parents and others their age do similar things to what you describe it makes me wonder about voting and driving with no age limits or proof of non-dementia.
Just like email phishing educating the public is very laborious but it is the ultimate solution. There will still be a few people who fall for scams no matter how extensive the PSA campaigns.
You need to fix scams at the source: sanction India and other countries until they kick up efforts to neutralize scammers, and replace insecure systems like SSN.
In that case, let’s ask for cognitive tests to gain the right to vote! Unfortunately there will be people who will never be capable of passing the test even during their 20s or 30s. Those who cannot pass the test could be less capable thanks to the environment (poor neighborhoods, poor education, bad childhood, missing one or two parents, exposed to toxic chemicals during pregnancy) or simply less lucky in the genetic side.
Are we ready to take away the right to vote from old people even if they are more capable than you and me? If not, are we ready to take away the right to vote from less privileged people?