Andy, I suppose that - if 70 doesn't qualify as 'a certain age' - nothing does! I suppose it is easy for younger people to forget that, for the vast bulk of my life, I had no access to any of the information-sources available today other than written ones.
I recall being quite excited by the advent of television in ordinary people's lives and of of the calculator! Accordingly, I had acquired just a smidgeon of information about all sorts of things long before the computer even came along. Thanks again.