I quickly learned to use a vitamin C serum in the morning (brightening, firming, neutralizes unstable "free radical" molecules that accelerate aging), supplemented with a moisturizing sunscreen (nothing ages faster than the UV exposure), and using a retinoid - it's retinol, or something stronger in the same family of ingredients - at night (for fewer wrinkles and smoother skin with a more even complexion), and it has greatly improved...