Collagen in the skin is one of the main things that makes it look youthful and healthy. Collagen is the number on protein that forms the structure in the skin. The look and feel of the skin is determined by the amount of collagen it has. The condition of that collagen also makes a difference.
As we age collagen does begin to break down. The sun is one of the main causes of skin damage. Some of the other factors that can affect the skin are hormones, environments, free radicals, and nutrition. Smoking has also been shown to cause the skin to age and become damaged.
The rate at which collagen is produced slows as we get older. The decreased collagen combined with damaged collagen leads to sagging, wrinkling, and even drooping skin. Collagen is the substance that plumps skin and makes it look youthful.
Some people think they can make skin look youthful again by simply applying a cream with collagen in it. Unfortunately it is not that easy. Collagen molecules are not small enough to penetrate deep into skin where they need to be to do their magic. Collagen can be injected. This does work temporarily to plump the area around the injection. The problem with injections is that the results do not last long. There can be adverse side effects, not to mention the high cost.
The only way to really get more collagen deep into the skin where it is needed is to actually increase natural collagen production. There are some great ingredients that have been shown to do just that. Vitamin C has been used for centuries. It can increase collagen production naturally. Some other ingredients that are also useful are hyaluronic acid and Matrixyl 3000. A good skin cream or skin serum with these ingredients used regularly can increase collagen production. This will make skin look and feel younger and fuller. It can also reduce wrinkles.
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Acne often shows up on the face as well as other areas of the body such as the back and chest. Sometimes acne and pimples also occur on the scalp. Even for people who may not experience acne on other parts of their body. Scalp acne can be hard to treat. It is often buried beneath the hair. 
The first signs of grey hair let most of us know we are getting older. For most people grey hair starts to appear in there late thirties. But premature graying starts for some individuals as early as their teens and twenties. The majority of us will find that about half of our hair will be gray at fifty. No matter when it starts most of us would rather not turn grey.