The fact that people mostly youths waited for a currency, bitcoin, doesn't mean they'll be interested in bitcoin when it launched for some reasons best known by the individuals.
What Op mean is the average number of people using bitcoin and this number are largely in youths no that true. the president of El Salvador adopting bitcoin in his country is youth
back when gold was use it was exclusive for the adults and advance age class but today bitcoin is largely use by youth age the old still more with banks.