it's interesting to know that, your parents are an observing type and as such, built an interest in the things they see you do quiet often.
I bet it was easier for OP to talk to his folks and that they gave him premium attention and a chance majorly because they already have a relationship with him and wanted to give him a chance to express himself. If there was no relationship say OP just randomly met some elderly persons and started to talk/educate them about bitcoin, his teaching process would not have gone smoothly as the case was with his parents IMO.
Many of us have enquiring minds, and are prepared to look at new concepts with an open attitude.
Not disputing this as a fact, but are mostly open minded to accept new innovations when presented by someone mature, around their age grade, someone they are already familiar with, a successful individual, someone they deem knowledgeable in a particular field and not just any random individual. The elderly are selective of the information they accept.