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Abstract Objective To investigate the associations between low education and risk of mental disorders, substance use disorders and self‐harm in different age‐groups. Methods All subjects in Stockholm born between 1931 and 1990 were linked to their own or their parent's highest education in 2000 and followed‐up for these disorders in health care registers 2001–2016. Subjects were stratified into four age‐groups: 10–18, 19–27, 28–50, and 51–70 years. Hazard Ratios with 95% Confidence Intervals (CIs) were estimated with Cox proportional hazard models. Results Low education increased the risk of substance use disorders and self‐harm in all age‐groups. Males aged 10–18 with low education had increased risks of ADHD and conduct disorders, and females a decreased risk of anorexia, bulimia and autism. Those aged 19–27 years had increased risks of anxiety and depression, and those aged 28–50 had increased risks of all mental disorders except anorexia and bulimia in males with Hazard Ratios ranging from 1.2 (95% CIs 1.0–1.3) for bipolar disorder to 5.4 (95% CIs 5.1–5.7) for drug use disorder. Females aged 51–70 years had increased risks of schizophrenia and autism. Conclusion Low education is associated with risk of most mental disorders, substance use disorders and self‐harm in all age‐groups, but especially among those aged 28–50 years.