I've seen the same trend. Some even say they don't really care about gold and put money into crypto.
The massive growth I suppose was coming from the fact that bitcoin is new and the potential is massive.
But moving forward I kinda expected the newer generation to be more familiar with bitcoin than gold to be honest.
Needless to say gold will still be as good store of value as it is today though.
Because BTC is digital - and people of this age tend to go for this rather than gold and assets that cannot be used on the get-go, so to speak.
BTC has much more going for it.