India, Oct. 22 -- With age, the risks of neurodegenerative disorders like Alzheimer's disease rise. As one grows older, the brain's volume also shrinks in size, losing both grey and white matter over time. A study published in PNAS on October 13, 2025, revealed that the brain's shrinking pace differs by sex, actually. Men's brains shrink faster than women's. So if there's a correlation between brain shrinkage and neurodegenerative disease, what does it say about women's increased vulnerability to Alzheimer's disease?

The study attempted to understand whether the brain tissue, grey and white matter, shrinks faster in men or women with age. So, according to the researchers, men's brains with age become smaller in volume, particularly the c...