I need to agree with the fact that people (especially older ones) still buy gold because it's what was tested with time and effort most of them all, but.. I still do think that if a person wants to diversify, he probably will be able to find something good in the crypto space too 
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.