If it is generation dependent, it will take about 25 years for the bitcoin to be very popular among general population.
This is gonna be very hard, of course that is a mission that is almost not possible due to the fact that the bitcoin is too new for elderly.
I think it will be very hard to let elderly learn the bitcoin.
Yes why we go for old generation present generation people also struggling to understand what is Bitcoin. I tried to explain my friends and and my own brother but it's un successful. They are making fun on this bitcoin so i stopped to explain them. until and unless all online shopping sites accept this bitcoin no new people will understand what is this bitcoin.
Yeah it can be hard at initial stage but if you try it continuously then you can surely divert their mind towards bitcoin and if they see it positively then they will surely start using it.