During your youth, lack of grooming alters the normal operation of the skin renewal system.
A thick crust is formed, inhibiting and slowing down every function of your skin: feel, perspiration, sebum, hair, ...
It stops the normal exfoliation of dead epidermis cells.
Your skin's corneal layer gets thicker and thicker.
New epidermis production is slowed down, sometimes halted.
Normally, your skin should stay the same all your life, except for changes at puberty.
Regular grooming goes hand in hand with the natural epidermis formation and desquamation process of your skin.
Some is produced daily, some is removed daily.