What are the specific range of your target with your statement old people?.
If you are trying to reach out the age over 50++ years old and does not related into the world of business and investment I think you are just wasting your time because they are afraid of changes, they want to mind their own business and be productive on their life.
In my perception, although bitcoin is very hard thing to explain to old persons, but i think the easiest way for them to understand is to tell its history or how it began. From its lowest value into popularity. Maybe by that way many old people would understand the concept of bitcoin and cryptocurrency. And also it's good to tell them that many investors got rich by investing in Bitcoin until now, so they might be enlightened.
I think if you will introduce them the use of the bitcoin they will said probably
I can't make deep down there
It's better to save my money for my family
I can do it my self
I don't want to risk any more
They are the one who value the money their earn.