John M argues that trick-or-treating should not have an age limit and people of all ages should be able to participate. Matthew S responds with three counterarguments: 1) Older children and adults can consume more candy, leaving less for younger kids. 2) By high school age, one can drive to buy their own candy. 3) Older children and adults tend to scare younger kids with costumes, which takes away from the fun experience for children that Halloween is meant to provide. Matthew concludes that the system of older individuals handing out candy works best to ensure younger kids can enjoy the holiday.