Text stimulus (timeline): Two-line timeline titled Changing Social Clocks in a Fictional Community Sample. Line 1980 sample markers: full-time job 21, partnership 24, first child or long-term caregiving 26. Line 2020 sample markers: full-time job 23, partnership 30, first child or long-term caregiving 31. Display details: a shared age axis from 18 to 35 and label each marker with age and milestone. What is the best conclusion about social clocks?