Longitudinal MRI studies of older adults reveal significant gray and white matter tissue loss, even in very healthy elderly. The study of 92 non-demented older adults (59–85 years) in the Baltimore Longitudinal Study of Aging (BLSA) found annual tissue loss rates of 5.4 cm³ for total brain volume, 2.4 cm³ for gray matter, and 3.1 cm³ for white matter. Ventricles increased by 1.4 cm³ per year. Frontal and parietal regions showed greater decline compared to temporal and occipital regions. Gray matter loss was most pronounced in orbital, inferior frontal, cingulate, insular, and inferior parietal regions, while white matter changes were widespread. These findings indicate significant longitudinal tissue loss in both gray and white matter, even in healthy older adults. The study also showed steady increases in ventricular CSF (V-CSF) with age. The results highlight the importance of longitudinal studies in understanding age-related brain changes and suggest that individuals who remain medically and cognitively healthy may experience slower rates of brain atrophy. The study used high-resolution MRI and validated image analysis techniques to quantify regional brain volume changes. Statistical analyses confirmed significant longitudinal changes in brain volumes and V-CSF, with no significant differences between men and women. The findings provide essential information on the rate and regional pattern of age-associated changes, which can be used to evaluate pathology. The study also identified regional patterns of vulnerability to age-related tissue loss, with frontal and parietal regions being more vulnerable than temporal and occipital regions. The results suggest that brain atrophy may be reduced in individuals who remain medically and cognitively healthy. The study underscores the importance of longitudinal MRI studies in understanding age-related brain changes and their implications for cognitive decline and dementia.Longitudinal MRI studies of older adults reveal significant gray and white matter tissue loss, even in very healthy elderly. The study of 92 non-demented older adults (59–85 years) in the Baltimore Longitudinal Study of Aging (BLSA) found annual tissue loss rates of 5.4 cm³ for total brain volume, 2.4 cm³ for gray matter, and 3.1 cm³ for white matter. Ventricles increased by 1.4 cm³ per year. Frontal and parietal regions showed greater decline compared to temporal and occipital regions. Gray matter loss was most pronounced in orbital, inferior frontal, cingulate, insular, and inferior parietal regions, while white matter changes were widespread. These findings indicate significant longitudinal tissue loss in both gray and white matter, even in healthy older adults. The study also showed steady increases in ventricular CSF (V-CSF) with age. The results highlight the importance of longitudinal studies in understanding age-related brain changes and suggest that individuals who remain medically and cognitively healthy may experience slower rates of brain atrophy. The study used high-resolution MRI and validated image analysis techniques to quantify regional brain volume changes. Statistical analyses confirmed significant longitudinal changes in brain volumes and V-CSF, with no significant differences between men and women. The findings provide essential information on the rate and regional pattern of age-associated changes, which can be used to evaluate pathology. The study also identified regional patterns of vulnerability to age-related tissue loss, with frontal and parietal regions being more vulnerable than temporal and occipital regions. The results suggest that brain atrophy may be reduced in individuals who remain medically and cognitively healthy. The study underscores the importance of longitudinal MRI studies in understanding age-related brain changes and their implications for cognitive decline and dementia.