Brain aging refers to the natural process of changes in the structure and function of the brain as individuals grow older. These changes can include decreases in cognitive abilities, such as memory, processing speed, and attention, as well as changes in brain volume and connectivity. Brain aging is a complex and multifaceted process that can be influenced by a variety of factors, including genetics, lifestyle, and environmental factors. Researchers studying brain aging aim to better understand the underlying mechanisms of age-related cognitive decline and develop interventions to promote healthy brain aging and prevent age-related neurodegenerative diseases, such as Alzheimer's disease.