No matter your age, your skin overall contains a mixture of both healthy cells and unhealthy cells. Of course, it’s not surprising that, as we age, there are biological changes in skin that affect the ratio of healthy and unhealthy skin cells. In chronologically older people, skin starts to weaken due to accumulating environmental damage and time. Weakened skin can’t protect as effectively, leading to further weakening. The result is unhealthier skin overall, which is perceived as showing visible signs of aging.