Yes maybe everyone heard about bitcoin. But the thing is, the only heard about it, but theres a big possibility that they just will neglect it. Not all people knows the use of bitcoin, not all people knows the benefits can get by the users and the important of it. But learning and using bitcoin is a life long learning, no one will forget even your were become old.
It is much better to say that more people know Bitcoin compare before that to say everyone know Bitcoin. Because even if we are all aware that there is a lot thing that technology could do and bring to disseminate information to people it is quite hard for some people to know Bitcoin depending on financial and social state that may hinder them on learning some information about the system of Bitcoin and specially on transaction that could be a form of crypto-currency that can be a vital part of investments.