Lyman Hall was the signer that also practiced medicine
The answer to this question is historical context, or to be more specific, cohort effects.
Historical context for midlife development are divided into two: social clock and cohort effects. Cohort effects are how changing times and different social expectations influence how group of people in the same generation move through the lifespan, while social clock is a timetable where an individual is expected to accomplish life stages, such as marriage and having children.
