That's what's happening in my country, I don't see young people interested in bitcoin, what they care about is having fun, buying branded goods, chasing celebrities, and living virtual lives on social networks rather than focusing on making money, let alone bitcoin. Most adults and married people are serious about bitcoin because what they need at that age is money to take care of life.
In general, those who see the potential of bitcoin and its benefits will be useful to them. It is not necessary that bitcoin is only useful for young people, not the older generation. Bitcoin is for everyone.
In Japan it's a little bit similar. Japan is still a "cash is king" country. Where in other places people pay a high % of stuff via card or some digital wallets, here in Japan most people still pay via cash.
For that reason, even though bitcoin and other crypto currencies are highly advertised, you can even pay in plenty of places with it, not many young folks are really into it.
I have been to bitcoin meetups in Tokyo several times and I would say the average age was in the late thirties.
Most people also have been into crypto for quite a while, there is a big community here. But very rarely I saw folks in the early 20s or even younger, don't understand why that is.
I mean bitcoin has a lot of value, especially when you are young. It's easier to learn and understand it fully and they could actually earn good money with this knowledge.