i think every person is different in my opinion. Bitcoin telling myself to my brother, and he told what it was and he was not interested in knowing bitcoin. It would be very easy if someone is interested in bitcoin would be very easy to explain. But your will be very difficult if one is not interested because of how hard we explain if they are not interested we could not force him. The most important thing about bitcoin explain just what it is, if they are interested explain further and if you tell an adult about bitcoin might no special strategy because they will be more easily attracted. but for a small child I doubt they'll know how to work of bitcoin and others. teens may also be easier