Dress up and have fun as long as you can. Clearly there’s a need for enthusiastic, polite teenagers to be seen in public on Halloween.
My oldest is 12 and she would have been so upset if we’d told her she was “too old” to go trick or treating with her brothers last night. Two of her friends came with us, and they were great to have along. I don’t really see what the big deal is. I say ignore the party poopers!
When I was in college, one of the service projects my sorority did every year was to go trick or treating for canned goods on Halloween. We dressed up, went in groups to different neighborhoods, and collected massive amounts of food for the local food bank. We had an absolutely fantastic time every year. Many people insisted we also take some candy! You could consider doing something like this on Halloween in the future. No one will give you a hard time, and they’ll be so impressed they’ll still happily give you candy. And, your local food bank or community dining room will truly appreciate it!