With the passage of time, the cheeks deepened and hollow out, giving the face a tired and sad appearance, especially among thin people.
This is caused and triggered by the re-absorption of the sub-cutaneous fat.
Furthermore, the hollowing can be seen even among the young due to sickness, extreme thinness or even as a normal constitutional feature.
There are several stages of filling cheeks exist. (See image)
Sometimes with age people get ‘crêpey-cheek’ ‘hallow cheeks’: this is when a fan of fine lines appear on the cheek, either during movement, or become permanently present.