Editorial on the Research Topic Longitudinal aging research: Cognition, behavior and neuroscienceThis Research Topic (RT) covers papers presented at the 5th International Conference on Aging & Cognition in Zurich (https://eucas.org/ac2019/). A particular focus of this RT is placed on longitudinal research, which is still underrepresented compared to the abundantly available cross-sectional studies. Longitudinal studies are, however, urgently needed to understand aging better. A further emphasis is placed on understanding "healthy aging, " thus excluding issues related to dementia, mild cognitive impairments, or clinically relevant limitations in other behavioral domains. Sixteen manuscripts have been accepted for final publication. Seven papers investigated longitudinal changes concerning neuroanatomical, neurophysiological, and psychometric aging issues (Jockwitz et al.