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Of the 216 participants, 30 were categorized as child\u2010onset (&lt;15\u2009years old), 104 adolescent\u2010onset (15\u201318\u2009years of age), and 82 \u201cemerging\u2010adult\u201d (19\u201324\u2009years of age); the three groups were compared on their clinical characteristics.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Among participants with lifetime diagnoses of AN with onsets earlier than 25\u2009years, adjusted prevalence rates for the three groups were: 11.8% (<jats:italic>SE<\/jats:italic>\u00a0=\u00a02.04; child\u2010onset), 39.6% (<jats:italic>SE<\/jats:italic>\u00a0=\u00a02.69; adolescent\u2010onset), and 48.6% (<jats:italic>SE<\/jats:italic>\u00a0=\u00a02.67; emerging\u2010adult). Child\u2010onset group reported more frequent adverse childhood experiences (ACEs), lowest BMI, longest episode\u2010duration, was least likely to attend college, and had highest rate of lifetime psychiatric comorbidity. Child\u2010onset group had earliest age of help\u2010seeking and were most likely to have been hospitalized. Group differences persisted in analyses adjusting for sociodemographic characteristics and duration of AN episode.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Our findings, based on a nationally representative sample of U.S. adults with lifetime diagnoses of AN, suggest that those with child\u2010onset had more severe AN, greater life difficulties, and greater lifetime psychiatric comorbidity. 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