One year, I think I was around 12, I told my family that I thought maybe I was too old to trick-or-treat so I would figure something else out. They were effusive about how wrong I was and unanimously told me absolutely not, I was still a kid and 100% I had to go trick-or-treating.
The next year I assumed I was still young enough, since they were so insistent the last time, so I told them I planned on going again. They all gave me worried looks and said I was clearly too old.
I don’t remember what age it was, but there is an exact age that people find acceptable, apparently. I’m tempted to go out now, many years later, just out of spite.