I first picked this up at age of about 11, from the bookshelf in a guesthouse where I was staying for a few nights with my parents. I was in a room by myself, and apart from a couple of shouted requests to shut up, was left to hold my sides and laugh as quietly as possible.
I'm now 52, and have a wonderful original copy which I have read time and again, and still get requests from my fiancee to shut up and stop laughing.
It doesn't matter how many times you read it. This is quite simply the funniest book ever written in the English language. Yes, it's based in an age long gone; but it's great to know that self-effacing, typical British humour hasn't changed one iota.
Any Englishman who hasn't read this is the poorer for it!