Editorial: Insights in neurocognitive aging and behavior: 2021

In recent years, exceptional scientific achievements have led to major advancements in the fast-growing field of neurocognitive aging and behavior. In this inaugural collection, Insights in Neurocognitive Aging and Behavior: 2021, we sought to highlight the latest advancements and challenges for the current state of knowledge and future directions in aging neuroscience in the neurocognitive arena. Here we outline the contributions and implications for future research of the 15 papers in this topic collection across four important research areas: (1) novel approaches to identifying and tracking brain aging and impending cognitive decline; (2) neurocognitive markers of risks for Alzheimer's disease (AD) and its progression; (3) lifestyle contributions to cognitive aging and AD; and (4) the status and future of neurocognitive and brain aging theory.