Often when someone wants to make a point that they are really experienced in the field they say something along the lines of, "I've been in this line of work for as long as your age, get off my lawn you kittens" or they'd name an antique computer's name and say "My first program was on PDP-11, get off my lawn" (When they want to say I'm a very experienced programmer).
What is the connection of owning a lawn and being very experienced and where do kittens fit in? What is the history of this phrase?
