This study examined whether the relationship between adverse childhood experiences (ACEs) and self-rated health among adults in a nationally representative population is modified by age, sex, or race/ethnicity. Cross-sectional study. United States. Data from the 2020 and 2021 Behavioral Risk Factor Surveillance System were obtained from 185731 (weighted N = 47862016) persons 18years or older. The ACE cumulative score (range: 0-11) was calculated using 11 questions about childhood emotional abuse, physical abuse, sexual abuse, and household dysfunction before age 18 and classified as 0 (reference), 1, 2, 3, or ≥4. Self-rated health was divided into (excellent/very good/good [reference]) and suboptimal (fair/poor) categories. Multivariable-adjusted logistic regression was conducted to test for the interaction with age, sex, and race/ethnicity with ACEs. After adjustment for potential confounders, an increasing number of ACEs had statistically significantly higher odds of suboptimal self-rated health in a graded manner except for 1 ACE (1 ACE: aOR:1.09; 95% CI: 1.00-1.20, 2 ACEs: 1.16; 1.03-1.30, 3 ACEs: 1.17; 1.03-1.32 and ≥4 ACEs: 1.39; 1.26-1.53). There was a significant interaction between ACEs and age. Younger age (18-24years) had the strongest association for ≥4 ACEs compared to the older age groups. There was no effect modification by sex or race. ACEs should be considered when creating health-promoting interventions to improve health.