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!
Gold and silver are most common investment of older people cause they can handle the low risk and I know the value of this two is continues increasing until now. I think the older people they can't afford to carry the risk in investing in cryptocurrency that's why they contented in gold and silver.