YOU KNOW YOU'RE TOO OLD TO TRICK 'N TREAT WHEN ...   You ask for high fiber candy only. People say, "Great Keith Richards mask!" and you're not wearing a mask. When someone drops a candy bar in your bag, you lose your balance and fall over. You're the only Mummy in the neighborhood with a walker. When the door opens you yell, "Trick or..." and can't remember the rest. You keep having to go back home to go to the restroom. You have to carefully choose a costume that won't dislodge your hairpiece. You get winded from knocking on the door. You have to have another kid chew the candy for you.