Shadi123.com

Basically, as we age our metabolism slows and our circulation becomes more sluggish. As a result, our skin goes short on the nutrients, altered looking to stay young and vibrant.

Skin begins to sag, when it dries and begins to lose its elasticity.
As you may have noticed, significantly slows aging of the skin's ability to heal itself. Even small flaws seem to take longer to go away.
Then there are highly charged oxygen molecules called "free radicals" that make a significant contribution to the deterioration of the skin condition.