Vitamin A (aka retinoids) are considered the gold standard in terms of skin care. But Topical Vitamin B3 and Vitamin C are also very important in overall skin health.
There are two types of skin aging: intrinsic and extrinsic. Intrinsic aging occurs in everyone and is characterized by dryness and thinning of the skin as you get older. Extrinsic aging is caused by external factors, most notably UV radiation from the sun and tanning beds.