Everything is a probability. There are some youth who are into gold. Probably many more who are into Bitcoin. I think the vast majority aren't into any monetary technology at all. Anyway, for this poll to mean anything we need to get more quantitative. For example, I might pose this as "For those with an opinion in the 18-34 age group, at what point do more than 50% of them identify Bitcoin as boomer/pet rock?"
For this I chose 2050+ or later. Forever is a very long time. What's with polls not appreciating the exponential?