The article discusses the differential aging of the brain, focusing on structural and functional changes associated with aging, their cognitive correlates, and factors that may influence the aging process. It reviews postmortem and in vivo studies, including MRI, volumetry, diffusion tensor imaging (DTI), and magnetic resonance spectroscopy (MRS), to understand age-related differences in brain structure and function. Key findings include reduced brain volume, white matter hyperintensities (WMH), and changes in neurotransmitter systems, stress, microvascular changes, calcium homeostasis, and demyelination. The article also explores how factors such as hypertension, aerobic fitness, and hormone replacement therapy may influence the aging process. It highlights that while some brain regions, like the prefrontal cortex, are more vulnerable to aging, others, such as the hippocampus, show more moderate changes. The study emphasizes the importance of understanding these differences to better understand cognitive aging and develop interventions to promote healthy aging. It also notes that longitudinal studies are crucial for understanding the progression of brain aging and its relationship with cognitive performance. The article concludes that while aging is a natural process, factors such as vascular disease and metabolic markers can significantly impact the trajectory of brain aging.The article discusses the differential aging of the brain, focusing on structural and functional changes associated with aging, their cognitive correlates, and factors that may influence the aging process. It reviews postmortem and in vivo studies, including MRI, volumetry, diffusion tensor imaging (DTI), and magnetic resonance spectroscopy (MRS), to understand age-related differences in brain structure and function. Key findings include reduced brain volume, white matter hyperintensities (WMH), and changes in neurotransmitter systems, stress, microvascular changes, calcium homeostasis, and demyelination. The article also explores how factors such as hypertension, aerobic fitness, and hormone replacement therapy may influence the aging process. It highlights that while some brain regions, like the prefrontal cortex, are more vulnerable to aging, others, such as the hippocampus, show more moderate changes. The study emphasizes the importance of understanding these differences to better understand cognitive aging and develop interventions to promote healthy aging. It also notes that longitudinal studies are crucial for understanding the progression of brain aging and its relationship with cognitive performance. The article concludes that while aging is a natural process, factors such as vascular disease and metabolic markers can significantly impact the trajectory of brain aging.