Gold and silver have a long history as a means of maintaining value and increasing value!
Older people can't afford high-risk investments, and gold and silver are low-risk for older people to invest!
I think so it is. Maybe also it is in their generation that they tend to trust more on gold amd silver. They also are not fond of using internet today because it is not their generation who loves to surf. They are into physical investment or something such as gold and silver.
It seems to me that even if you invest in cryptocurrencies, it is not bad to have investments in gold and real estate. Reasonable diversification has never hurt anyone