The reason why many young people are more interested in cryptocurrency than the older generation is because they are more eager to know what around them and also young generation are more exposed in technology, so it will easily for them to adopt Bitcoin, unlike to those older generation. That's why there's a lot young generation is more interested in bitcoin.
As far as i see, the true reason behind this is young generation already surrounded by technologies since they were born. Just imagine that when they were still babies, they had seen their parents and people around them using gadgets and other technologies. I think cryptocurrency and blockchain will be a general knowledge in the near future.