The older people will get an asset that is safer and well known. Not a risky less known asset. Hence they will prefer gold over bitcoin. But the younger will try to explore more risks and hence they have a lower threshold for buying bitcoin.
There are older investors into bitcoin but this number is small, specially fixed to those who are tech savvy.
Searching for something good in the crypto space does not make any sense. Rather buy bitcoin and continue buying it whenever the prices drop.
Besides BTC itself, I would still go for bigger caps rather than gold itself - because in crypto, potential would be still bigger and eventually, big caps (if hodled on spot too), would bring results, even though the best coin to accumulate and hodl and use to that extent is BTC.