ANY AGE! I worked with Estée Lauder for 4 years and I started using this when I was 18 and I will be 26 in a couple of months and have never gone a day without using this! It is my total go to product!
I would recommend at least 19-20 it doesn't have any effect on very young skin my niece 13 tried it and it basically did nothing for her except moisturize. Which makes sense since she doesn't have any wrinkles or anything