I think they see these as the real asset that do not depreciate with time, so they feel more secure about it. And their generation is use to the gold and silver as been the real valuable asset of security.
many factors, from the start they do not understand the technology, especially the world of crypto, maybe even though they already feel it but still they do not understand with kegunaanya, because gold and silver more real so they believe in the real thing, it could be because the cause because crypto is not so they are hard to believe.