Glogau Classification of Photoaging
| Group | Classification | Typical Age | Description | Skin Characteristics |
| I | Mild | 28-35 | No wrinkles | Early Photoaging: mild pigment changes, no keratosis, minimal wrinkles, minimal or no makeup |
| II | Moderate | 35-50 | Wrinkles in motion | Early to Moderate Photoaging: Early brown spots visible, keratosis palpable but not visible, parallel smile lines begin to appear, wears some foundation |
| III | Advanced | 50-65 | Wrinkles at rest | Advanced Photoaging: Obvious discolorations, visible capillaries (telangiectasias), visible keratosis, wears heavier foundation always |
| IV | Severe | 60-75 | Only wrinkles | Severe Photoaging: Yellow-gray skin color, prior skin malignancies, wrinkles throughout - no normal skin, cannot wear makeup because it cakes and cracks |
