adoption is happening now. Bitcoin has not become the preserve of the new millennium generation or the youth.
I saw early today an old man (about 75 years old) wearing Bitcoin shirt.
I tried to explain it to my parents and several other adults. They do not care about this technology and do not believe in an alternative of banknotes.
There are some early investors in bitcoin for sure that is somehow to know bitcoin at early or maybe even be able to invest in bitcoin.
I think it might actually depend on some countries because technology is not really adapted in some countries even bitcoin technology, most of the people from poor countries don't have any knowledge about bitcoin.
Even some of the elders here in my countries do not know what bitcoin is, probably they just heard it from the news as a scam thing, mostly elders these days are not really that into technology.