According to epidemiological research, at what age does 50% of all lifetime mental ill-health begin, and by what age have 75% of cases started?

• A. 50% by age 21 and 75% by age 35
• B. 50% by age 18 and 75% by age 30
• C. 50% by age 14 and 75% by age 24
• D. 50% by age 10 and 75% by age 20

Answer: (C)

Verified step by step guidance

1. Understand that the question is about the typical age of onset for mental ill-health based on epidemiological research, which studies the distribution and determinants of health-related states in populations.
2. Recall that epidemiological studies have consistently found that a significant proportion of mental health disorders begin in adolescence or early adulthood.
3. Recognize that the key statistic here is the age by which 50% of all lifetime mental ill-health cases have started, and the age by which 75% have started.
4. Review the research findings which indicate that 50% of lifetime mental ill-health begins by around age 14, and 75% by around age 24, reflecting early onset during teenage years and young adulthood.
5. Use this knowledge to select the correct answer: 50% by age 14 and 75% by age 24.