Men and women wearing kimonos attend the “Coming-of-Age Day” celebration at Tokyo Disneyland in Urayasu on Monday. The legal age of adulthood in Japan is 20 years old. /VCG Photo

Disney characters Mickey and Minnie Mouse smile with a man and woman who’ve come of age in Japan. /VCG Photo

The national holiday celebrates reaching the age of maturity at 20 as an important part of a young adult’s life, when they can legally smoke and drink alcohol. /VCG Photo

The number of 20-year-olds in Japan is estimated to have reached 1.23 million this year. The number for this age has been in consistent decline over the past several years, which reflects Japan's falling birth rates. /VCG Photo