They probably never will, so don't be hard on yourself because of that. On my father's birthday, I bought him an easy to understand book explaining the basics of Bitcoin. He read a few pages and never finished it. When some people get to a certain age, they lose the willingness to adopt new knowledge and change. He has been working in the banking and IT sector, has never had nasty experiences when it comes to banks and his financials, and he simply doesn't see why he should abandon a system that has worked well for him personally all his life. 

When we are on the subject of explaining Bitcoin, I would say that it's a technological breakthrough comparable to the Internet and Email of the 90s. Bitcoin is the first and most successful implementation of a tech known as blockchain that has no centralized authority, allows you to control how and where you send and store your money without answering to anyone else.

---

Did you by any chance see my thread Do you know the difference between Bitcoin and bitcoin?