Geez, you guys are all a bunch of old farts.
So, you think 45 year olds, without any children, should just dress up and go door to door looking for free candy?
No one's saying adults shouldn't get dressed up in costumes, go to work that way, have a party with friends, etc.
It's the walking from door to door with a bag collecting miniature snickers and peppermint patties.
Have as many bowls of candy at work or at your party.
An adult walking around like the kids would be really lame.