The body goes through many changes during a lifetime and a lot of these changes are due to your hormone levels. Any fluctuations can cause problems for the skin, with oestrogen and testosterone being the biggest culprits.
Oestrogen is the female sex hormone which, when at an optimum level, keeps the skin smooth and firm as it aids in collagen production. It also ensures that the skin can retain moisture and helps it to recover faster following trauma. During the menopause, these levels drop which is why the skin becomes dry, red and prone to wrinkles.
Testosterone is the male sex hormone but it is present in both sexes. When the levels of this hormone increase, usually during puberty, it causes the pores to become enlarged and start producing more sebum which is responsible for oily skin and acne.