When my now 17.5 daughter was 10, I took her to a leading dermatologist in our area as a proactive approach to just check her skin. We both go yearly now just for updates and checks.
At the age of 10, she also started using Clinique mild facial wash and gel moisturizer. As she got a little older and more prone to breakouts, especially during her time of the month, she used the Clinique Acne wash and gel moisturizer. Clinique also has a spot gel for the occasional pimple.
She has flawless skin... a lot due to genes, a lot due to her diet and activity. I'm very fortunate to have a child very focused on good nuritional foods. She is also very active with cheerleading.
We never, ever go to bed without our facial routine and same for the mornings. It is something I have done since age 10 and she has seen me do it for years.
I use the Clinique line as well. I use the Repairwear series. I love the Clinique products, they are dermatologist recommended as one of the best. If your skin does not work well with Clinique, you get your money back.
Most Clinique counters at department stores have associates who work for the store and an associate who works specifically for Clinique.
I have used Clinique faithfully since I was about 10 or so and I just turned 50. I am proud to say I don't look a day over 35 and sometimes pass for younger. Granted... Clinique is not the only factor for my success, I was blessed with good genes, I drink a lot of water and always use sunscreen.
Good luck.