The outer layer of your skin renews itself every 2-4 weeks, but the dermis layer is pretty permanent. The things you do to your skin in your teens and 20s can affect your skin's look almost immediately. It is critical that you take good care of your skin, and your body, if you want to look and feel good.
Tanning and Sun
Hopefully every person alive now knows the dangers of the sun and tanning. It can cause skin cancer - and not just when you are 60 or 70. I know people in their teens who have died of skin cancer. If you don't get skin cancer, you are also destroying your dermis layer. The dermis layer gives your skin its elasticity and firmness. So if you desroy your dermis, your skin looks wrinkled and saggy - even by age 21. Eat
You are what you eat, from your head down to your feet! If you eat healthy foods with nutrients, your skin reacts positively and glows. If you eat tons of junk food and sugar, your skin gets bloaty, dull and listless. It can have a direct impact on how you look.
Drink Lots of Water
You may think that drinking lots of water makes you look pudgy. But actually your body only holds onto water when it thinks there is a DROUGHT. That means if you drink only a little water, your body will cling onto it with a passion and make you look water-logged. If you drink lots of water, it lets your blood do its job flushing the toxins from your system, and your body lets the water go out of your system because it knows more is coming soon. The more water you drink, the more healthy you look and feel.
Get Lots of Sleep
You know how people who are not sleeping well have dark rings under their eyes? Your skin shows very clearly when you are not getting enough sleep. Sleep lets your body renew and refresh. Avoid Smoking
One of the best known destroyers of skin (besides the sun) is smoking. Smoking causes ALL sorts of health issues, and destruction of your skin is just one of them.