The best age to cut double eyelids is generally after puberty, and the earliest age is 14 to 15. Boys are relatively late, usually after 16 or 17 years old. At this time, people's development is basically stereotyped, and all facial development basically stops. You can consider making double eyelids. Otherwise, when they develop in adolescence, their faces are also changing. If they do double eyelids too early, they may not be in harmony with the development of the whole face.