Collagen and elastin, many people don't know this but these are the main reasons why we age and also the main reason why we stay young.
Behind it all it is the process of aging which is a natural process and as we grow older our bodies start to slowly die, one might say. When that happens, collagen and elastin productions in the skin slow down and they decrease. With collagen and elastin decreasing, those 2 being essential chemicals for the skin, you can imagine that without them, the skin will dry up and lose elasticity and get saggy, etc. But this happens slowly so one does not have to worry too much, you'd have to reach 30 years for those wrinkles on your face to become significant, even then it wouldn't be a big problem, near 40 maybe. But i'm sure you've seen people, or maybe you yourself have significant skin problems even though you're not even 30 yet and you look like 30+ or 40. If this is true, it is because you're doing something wrong, more specifically, you probably don't eat well and have an unbalanced and unhealthy lifestyle. You maybe smoke, smoking causes premature aging in all people, depending on how much a person smokes. And of course it is a known fact that it causes overall damage to the health of an individual and can be the cause for cancer. Eating unhealthy is another reason why one could look older than he/she actually is. The skin, just like the body, needs essential nutrients to look the way it does, to stay healthy. If the body is not working properly, if it is tired and needs rest and you're not giving it the proper rest it needs, the skin will also suffer.
This is a fact, dark circles and puffy/baggy eyes appear when we are depressed and tired/stressed.

So the reason to stay healthy and also look good is obvious and should not come as a surprise to anyone, you just have to lead a healthy and balanced life. So why aren't people doing that? Well, because people generally prefer the easier options in life, instead of the hard ones.
They do not have the time to exercise, to be active, to eat home cooked and healthy meals so they eat out, junk/fast-food. So what do most people do? Well, the options of getting rid of aging signs and slowing down aging are pretty wide, but the most popular is probably through the use of skin-care creams and lotions. Containing anti-oxidants to protect the skin from toxins, pollution and other harmful and environmental factors, enhancing the collagen and elastin productions, hydrating and moisturizing the skin, and with other good effects and little to no harmful side-effects this makes anti-aging skin-care creams one of the best choices for a healthier and better looking skin.