Coming of Age Day, celebrated at the start of January, is the day where children officially become adults in Japan. Anyone who has turned 20 years old in the past year participates in a celebration. They dress up, either wearing a kimono (women) or a suit (men) and take lots of pictures to commemorate their entry into adult society. While you can vote at the age of 18 in Japan, you cannot get your driver's license or do many other things until the age of 20, so it's a very significant and important day.