Final answer:
Age-related changes to the skin include a loss of collagen and thinner, fragile nails. These changes contribute to wrinkles and a reduction in skin's elasticity, alongside drier skin and decreased cell regeneration.
Step-by-step explanation:
Age-related changes in the skin include a variety of factors, some of which are a loss of collagen, leading to a reduction in skin elasticity and the appearance of wrinkles. The skin and its accessory structures experience lowered activity, resulting in thinner, fragile nails and hair, as well as decreased sebum and sweat production. As the dermis loses its ability to regenerate effectively, there is a noticeable decrease in the skin's resilience, contributing to slower wound healing and a thinner epidermis. It is also important to note that age affects all tissues and organs, leading to a general decrease in cell regeneration and muscle atrophy.
Given these points, the correct answers concerning age-related changes in the skin are B. a loss of collagen, and D. thinner, fragile nails. Despite the decrease in some bodily functions and changes in appearance like paler skin tone and wrinkles, other supposed changes like an oily scalp or improved blood supply (A and E) do not typically characterize the aging process. Instead, the skin tends to become drier and less elastic, while the overall effectiveness of blood circulation and cell regeneration tends to decline with age.