Final answer:
Corrine, whose priority is marriage and children, aligns closely with traditional milestones for adulthood, thereby possessing the earliest social clock timetable.
Step-by-step explanation:
Based on text research, the individual who might have the youngest/earliest social clock timetable for becoming a full-time adult is Corrine whose main priority is having kids and getting married. This is because the traditional five milestones that define adulthood include completing school, leaving home, becoming financially independent, marrying, and having a child. These milestones have traditionally been the markers for reaching adulthood, and Corrine's goals align with several of these milestones.
Millennials are experiencing a shift, with many taking longer to reach these milestones due to factors such as economic instability and changes in the workforce requiring higher levels of education. This has contributed to a demographic referred to as the Boomerang Generation, who often return home after college graduation due to inadequate employment opportunities. Across different cultures, the timing and expectation of these milestones vary, with some encouraging workforce or college right after high school, while others recognize military service or taking a gap year as part of the transition to adulthood.