Final answer:
The text does not address the broad effects of sun exposure on aging skin in midlife; it includes information on changes in skin elasticity, formation of wrinkles, and factors contributing to hair loss.
Step-by-step explanation:
The text regarding aging skin in midlife clearly includes information on changes in skin elasticity, the formation of wrinkles, and hair loss due to reduced melanin production and thinner hair. Additionally, there is mention of the impact of UV light possibly contributing to wrinkles. However, it does not distinctly address the effects of sun exposure as a broad topic within the provided text. Therefore, the correct answer is that 'D. Effects of sun exposure' were not included in this specific text on aging skin in midlife.