Objectification of Skin Firmness: In Vivo Evaluation of 300 Women in Relation to Age.

Background: The concept of "skin quality" (SQ) has gained widespread attention, with a recent international consensus defining it and outlining four "emergent perceptual categories" (EPCs), each accompanied by specific parameters and associated measurement methods. No research has confirmed whether the parameters linked to these EPCs vary objectively with age. This gap in data is significant, as understanding how these parameters correlate with age could be essential for creating an objective, age-adjusted classification of SQ.