If you ask how to explain Bitcoin to old people, I will share my experience. I have parents who are not young anymore, in the beginning I explained Bitcoin to them in 2017. I explained to my parents that "Bitcoin is a digital currency, which has a limited supply, and has fantastic value. easy to make transactions in large quantities anywhere and anytime. And the unique thing is bitcoin can be mined and traded ". At least that's how I explained Bitcoin to my parents.
And how about their response, I'm sure even you share that kind of experienced and knowledge the reaction is not the same with how you understand bitcoin, old folks are very skeptical in terms of currency, most likely they will just say yes but the truth is they will not really put it inside their heads. They will continue to support what they regularly use and will be hard for them to adjust in new things that they are not really understand.