A dream of inviting our old citizens to bitcoin will not be possible if we ourselves lacks the fundamental knowledge about it, the best way to properly explain things is to first learn and use it. There's we can formulate various analogy to correlate terms and to lead them in the right path as they engage themselves with bitcoin. I believe that there's no boundary of ages for people to use it, that is why I like to learn and use bitcoin.
Indeed there's no age requirement to use or join bitcoin. But for newbies or even old people who are interested and want to get involve in crypto world, the terms/words might sound gibberish to them that's why its a challenge to use simple terms and word for them to understand it better. There's also plenty videos and blogs on the internet for them to see on "what is bitcoin?" for starts until they eventually learn the fundamentals.
There's also a lot of perks about bitcoin because it's a digital currency, it can be used as mode of payment or transaction. Or buy/sell bitcoins so that you can make profits from it to make your life more comfortable.