The degree of facial youth is determined by the following main factors: 1. Morphology: 40% The influence of morphology is the most important. The morphology of the upper face is mainly characterized by sagging eyebrows, thickening of the upper eyelids, changes in the shape of the upper eyelids after ptosis, from wide to narrow, from a graceful arc to a fold, and in severe cases, the formation of “triangular eyes”, especially at the outer corners of the eyes, where the upper eyelids are pressed down, forming a crease that extends beyond the orbit; and temporal depression. The aging pattern of the midface is mainly manifested by the formation of nasolabial folds and the accumulation of fat in the front cheek area from light to heavy (the fat in the front cheek area moves down and accumulates) and the formation of “sheep cheek face” (the fat in the middle cheek area moves down and accumulates). When the midface is aged, the curve of the cheek profile becomes complicated from a straight curve when viewed from different angles. The serious morphological change of neck aging is the formation of “turkey neck”-like change, which is manifested as a longitudinal sagging crease in the middle of the neck, mostly seen in Westerners, but generally no obvious morphological change in Chinese people. 2, the emergence of folds (creases): 30% Over time, some people will appear obvious forehead lines, frown lines, crow’s feet at the corners of the eyes, nasolabial fold lines on the cheeks, the formation of serious creases, all these wrinkles are dynamic lines at the earliest, gradually become static lines, as well as the formation of pre-ear wrinkles. 3, skin texture changes 20%: skin elasticity deterioration, color gradually dull. 4.Other: 10% Hair changes, mental state, etc.