When should you start taking care of your skin? You should start good daily skincare routine as soon as possible, don't wait till a problem arises. Age doesn't matter, age is not a skin type.
I played sports and took ballet from the time I was 7 yrs. old and because my Mom taught me to take care of my skin early, I never had to really deal with acne problems as a teenager.

+Every morning and night, wash your face with a gentle cleanser.
+Apply sunscreen or moisturizer with SPF when going outside.
+Exfoliate your skin at least twice a week to get rid of dead skin.
+Using a mask will help keep pores clear
+Always rinse with cool water so that your pores can close and keep bacteria from getting in.
+Always pat dry

And always look to see what's in your skincare cause most have chemicals and this will only make your skin worse (and it only takes 26 seconds for the chemicals to enter your bloodstream)
If you have any questions feel free to message me about what skincare routine is best for you!