It is related to the resolution of the camera. Think about it, if it is a particularly clear camera, many parts of the face will be too clear, giving people the feeling that people's faces will be rough, which is one of the reasons for getting old.

Also, it is the collocation of color and light. Many cameras are biased towards one color, and different shades will make people's faces look different in age. There is also the collocation of ambient light. If the face can be a little brighter, it will look brighter and younger.

Your question is rather general. The resolution of the camera only affects the sharpness of the camera. There may be many reasons for being old-fashioned. I hope you can solve this problem as soon as possible.