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The choice that describes the expected normal age-related changes in hair and skin is generalized thinning of hair and dry skin. As individuals age, it's common to experience a reduction in the number of hair follicles, leading to thinning hair and a gradual loss of pigment, which can contribute to gray or white hair. Additionally, skin undergoes changes due to the decreased production of natural oils and moisture, resulting in dryness and less elasticity.

This natural aging process is influenced by various factors, including genetics, environmental exposures, and lifestyle choices. In contrast, severe hair loss and skin rashes are not typical age-related changes but may indicate underlying health conditions or external factors such as allergies, so they are not considered part of the normal aging process. Uniform thickening of the skin does not generally occur with aging; instead, the skin often becomes thinner and more fragile. Lastly, while some individuals may experience a stable appearance of hair and skin, it's more accurate to denote the typical changes seen in many people as they age, which includes thinning and dryness.