Aging is a whole state, not whether there are wrinkles on the face, so there is an idiom that people will show an old state when they are old.
With the growth of age, after a certain age, people slowly begin to age, and the collagen of the skin is gradually losing. When there is less collagen, the supporting force of the skin decreases, and then the skin relaxes and begins to sag.
In fact, the skin is like a balloon. When I was young, collagen was full, just like an inflated balloon. The skin is firm and full, and the loss of collagen is like discouraged skin gas. The skin is no longer full, but loose, without the support of collagen, and begins to sag. Sagging skin tends to accumulate fat.
So when people get old, their faces will become longer, bigger and puffy. It is because the skin sags, the skin is no longer full of collagen, but the fat accumulates under the skin and the fat structure is slack, so the whole face looks loose.
You can compare photos of stars. When you are young, your sharp face will become round or long, and your face will no longer be tight. Your face will look very square, mainly due to sagging skin and fat accumulation.
The whole skin of the human body is like this. When people get old, the overall muscle feeling is the trend of relaxation and sagging.
Look at Faye Yu and Faye Wong. They are actually well maintained, with smooth skin and no wrinkles. But at first glance, people in their 40 s and 50 s no longer have a tight face, but they look loose as a whole.