[Solved] Explain why the role of the hypothalamic-pituitary-adrenal axis is important in health psychology. Middle Adulthood: A stage of life typically ranging from about 40 to 65 years of age, characterized by increased focus on personal and professional achievement, stability, and health. Erotic Plasticity: The degree to which an individual's sex drive can be changed by social, cultural, or situational factors. Gender Difference: Variations in characteristics, behaviors, or attitudes between males and females, often influenced by social, cultural, and biological factors. Sexual Orientation: A person's pattern of emotional, romantic, or sexual attraction to others, which can include heterosexuality, homosexuality, bisexuality, and more.