On Becoming An Old Fart

Don't know how this happened, but I've somehow become one of those annoying people who say things like, "When I was your age" and "When I was a kid" and "By the time you're my age". And as soon as those words come out of my mouth, I can't help thinking, "Dear God. Am I really that old?"
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Other signs of old fartage?

Not wanting to go out as much as I used to. You'd need to sandblast me out of the comfort of home in order to go to a party on a Sunday night because Sundays are now early nights for me and I prefer settling in front of the TV to watch Desperate Housewives and Grey's Anatomy after dinner.