The age of majority in Japan is 20, meaning that individuals under the age of 20 are generally not considered adults under Japanese law. However, there are exceptions, such as the ability to marry and make certain legal decisions with parental consent for those aged 18 or 19. Ageism is a pervasive issue in Japanese society, and understanding Japanese law and culture requires careful consideration of all relevant factors. For international visitors to Japan, it's important to understand the country's laws regarding minors and adults.