I like to think of him as a retired cop in a way- his skills might be a bit rusty (hiding in that hut for so long) but he's still got his piece (ie lightsaber) and still remembers how to use it when he needs to.
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That and ol' Georgy boy probably just through it in there as a throw-a-way line to help reinforce the crazy, old hermit idea he was trying to push with Obi this early in the film.