Young people are often more enthusiastic and driven by new technologies and inventions, so it's no surprise that Bitcoin is so popular among young people. older people on the contrary, they are typically wary of anything new and prefer to stick to the old ways.
I guess why young people are so keen to invest in Bitcoin is its decentralization which provides equal opportunities for everyone regardless of whether they are rich or poor, and whether they have capital or not.
Young people have many opportunities by learning and acquiring the skills necessary to start their own Bitcoin investments without need for significant capital.
I would say that young people see profit more than anything, but, I surely hope more see what Bitcoin truly represents - the ability to be in charge of your own custody and having an alternative out there.