• Acne life: 6-14 years and longer
• Adolescents: 85% develop mild acne (zits); 15% develop clinical acne ranging from mild to severe
• Infantile acne: rare
• Race: Black Americans < Whites; White Americans > Japanese, Swiss

Females	Males
Earlier than males	Peak between 16-19 years
Some as young as 8-9 years	35% affected
Peak between 14-17 years	1% at age 40
40% of females affected
Common > 30 years (Acne Tarda)
5% affected at age 40

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