Emerging adulthood and sentencing in Minnesota, 2016–2019: Focal concerns, developmental science, and judicial decision-making

Emerging adulthood (ages 18–25) represents a distinct developmental period marked by ongoing brain and psychosocial maturation, yet its influence on sentencing outcomes remains under-researched. Drawing on focal concerns theory and developmental neuroscience, this study uses Minnesota sentencing data from 2016 to 2019 to assess whether sentencing patterns for emerging adults align with expectations derived from developmental research. The results indicate that emerging adult status is not consistently treated as a mitigator in judicial decision-making. Instead, emerging adult offenders often receive longer sentences and harsher sanctions than older adults, suggesting that judges prioritize perceptions of future risk to the community and practical constraints over diminished culpability due to brain immaturity. The effect of emerging adulthood on sentencing practice is moderated by sex and offense type, but not by race. Findings highlight the need to formally and systematically integrate developmental neuroscience into sentencing practice, such as sentencing guideline provisions, departure rationales, risk assessment instruments, and judicial training. More systematic integration could promote more consistent, equitable, and evidence-based sentencing for emerging adult offenders, strengthening the connection between developmental research and criminal justice policy. • Emerging adults in Minnesota face higher likelihood of incarceration than older adults. • Offenders aged 21–25 get longer sentences and fewer mitigated departures than 18–21. • Age effects vary by offense type, strongest in drug cases and mixed for other offenses. • Race/ethnicity does not moderate age effects despite of adultification concerns. • Policy should embed developmental science in sentencing guidelines, risk tools, and judicial training. • Create guideline commentary linking emerging adult status to mitigator to standardize departure decisions.