20 years old. Ck belt can be used by 20-year-old boys. CK's men's belt is a rare small-size belt brand. Very suitable for young, thin boys. After buying it, it is almost unnecessary to cut it, and the shortest one is as low as 90cm. This belt of CK is buckle-type and can be used on both sides. It is also very suitable for little boys. The brand ck is highly recognized among young people.