From what age can I register?
Affiliator: Must be age 20 or older (Students will be refused)
User: Must be age 20 or older (Students are permitted to join)
Since April 1, 2022, the age of adulthood has been lowered from 20 to 18 years due to amendments to the civil code. However, both affiliators and users must be over 20 years old.
The government also has strong concerns about the problems caused by the age reduction, and we have taken them into consideration and have determined that you must be over 20 years of age.
https://www.kokusen.go.jp/news/data/n-20210408_1.html
National Consumer Affairs Center Published Article (available only in Japanese)
Documents for Identification
We ask that you provide a photo of yourself so that we can verify your identity.Basically, if you have a photo of yourself, you don't need any supporting documents.
Japanese citizens should provide a drivers license, a passport, or My Number Card, etc.
Citizens of a foreign country must provide their residence card, passport, alien registration certificate, special permanent residence certificate, etc.