Besides having facial hair, there are structural differences between a man's skin and a woman's. Androgen (testosterone) stimulation causes an increase in skin thickness, which accounts for why a man's skin is about 25% thicker than a woman's. In addition to being thicker, a man's skin texture is tougher.
Sebum (oil) and its production also differ. After puberty, sebum production is greater in males than females, which is attributed to androgen secretions and accounts for why men have longer lasting acne.
Regardless of age, men also have a higher collagen density than women. Because collagen content is directly related to the signs of skin ageing, it has been said a woman's skin is about 15 years older than a man's of the same age. However, men are less sun savvy than women, meaning they don't use sunscreens, and could contribute to why the “15 year” skin age difference is not readily noticed. UV damage from the sun can add years to a man's skin and negate the benefit of slowed intrinsic ageing.