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.
Bitcoin is not difficult rather different type of financial system, that's why it will take time before people will get used to its terminologies. The real hurdle in making Bitcoin one of the fundamental tech in the world is government regulations apart from scalability and volatility. In one decade btc has made huge progress by making it to every corner of the world. Let's see how much progress btc make in second decade.