CONCLUSION: The AgeWell.de-intervention successfully reduced dementia risk, assessed using the LIBRA-score, underscoring the usefulness of the LIBRA as a surrogate outcome when interpreting success of multidomain lifestyle interventions. However, several risk factors for dementia captured in the LIBRA, e.g., physical inactivity, did not change due to the intervention, possibly requiring more intensive interventions and support of participants in conducting the …