XS: approximately 5-7 years (21 to 23 in. hips) S: approximately 7-9 years (23 to 25 in. hips) M: approximately 9-11 years (25-28 in. hips) L: approximately 12-14 years (28-29 in. hips) TG: about 15-17 years old (30 to 32 in. hips) XXL: Teen/Adult (34-36 in. hips)