More than 15 years after the German reunification, were there differences in the personal resources among adolescents born around 1989 between East and West? How did the differences of this generation develop? Data from the study on the health of children, adolescents and young adults in Germany (KiGGS study) from the years 2003-2006 and 2014-2017 are used to determine the prevalence of low personal resources in 14-17-year-old adolescents in Eastern and Western Germany. Cross-sectional data at both time periods are compared between East and West, and longitudinal data are used to follow the cohort over the course of age RESULTS: Around 15 years after the German reunification, 14- to 17-year-olds from East Germany more frequently show fewer personal resources and have lower self-efficacy expectations than adolescents of the same age in West Germany. 10 years later, these differences are barely visible and have partially reversed. The east-west differences found cannot be explained by the different socio-economic situations of the families in East and West. The results show that in the 2000s, adolescents born around 1989 from families living in Eastern Germany, showed a higher risk of having fewer personal resources than adolescents from families living in Western Germany. 25 years after the German reunification this is no longer recognizable. While the differences between East and West decrease over time, the importance of the socio-economic situation of the family for the personal resources of adolescents as a whole increases, to the detriment of those with a lower socioeconomic status. The results indicate the need for targeted interventions to strengthen psychosocial resources especially for children and adolescents in phases of transformation and biographical breaks.