My ds just turned 4 he has a costume for nursery today and my bil is taking his 2 year old out trick or treating later. I never went when I was young as parents didn't believe in it so not sure if 4 is an ok age to go or too young? Also what sort of time are you meant to go? And do you knock on every door or just people you know or have decorations up? Sorry if these questions seem stupid!