I had to explain to someone recently that, no, they only get somewhere between 3 and 5 feet long - for some reason they were thinking 15? I don't know what they thought he was.
That said - I own my own house and am middle aged. I kind of figure it's mostly my business what I have. If it's relevant and comes up, I tell. Except my mother, who will never, ever know because she will, like your granny, stop coming into my house. She's petrified of snakes.