I see that the last post for this topic has been in december and that you have only posted once. I hope you are still visiting this site as there is a lot to learn.
As for your question I do not think you are too young to start using vitamin e or vitamin c. But I do think that you should do as much reading as you can so you can make choices that work for you. At age 22 you should really be finding a sunscreen that you are happy to wear every day along with other sun protection measures as wearing eye glasses. A good cleansing routine can also do wonders for your skin and is a good investment.
Vitamin e is a pretty safe ingredient to use and is widely available at a reasonable price. If you are into diy skin care you can also use vitamin e capsules by adding the contents to creams or putting the oil straight onto your skin. This is best for night as it is quite a heavy oil.
Vitamic c is best to start slowly. It comes in different strengths and some peoples first reaction is to start strong as that is the best. However vitamin c is essentially an acid so use should be gradual and cautious. Vitamin c also comes in various forms and some are better then others. This is where research comes in. This way you will also save a lot of money and hopefully get results you are after.
Good luck. Skin care is a lot of fun. Let us know how you are going.