Final answer:
A society's age-graded expectations for major life events is referred to as its Social clock, which establishes the culturally appropriate times for life milestones.
Step-by-step explanation:
A society's age-graded expectations for major life events is its Social clock. The concept of the social clock refers to the cultural and social norms that establish the appropriate timing for certain life milestones, such as education, marriage, parenthood, and retirement. This social timeline varies from culture to culture and provides individuals with a framework by which they can gauge their progress through life's stages. It acts as a sort of informal schedule that society expects individuals to follow throughout their lives.