I don't have a readymade answer for this. My father is 78-years old and I have been teaching him how to use a smartphone for the last 4-5 years. And even after all these years, he can only do the most basic tasks on his own. I have given up teaching and I guess he will be OK with whatever knowledge he is having. When it is so difficult for the old people to learn even the basic technology, I don't know how you guys are expecting them to understand complex technology such as cryptocurrency and Blockchain.