Generalized brain volume

Your brain volume changes over your lifespan. Peak volume is usually reached around 40 years of age after which the brain volume starts decline slowly about 5% per decade. Around 70 years of age the rate of decline increases. The shrinking is observed particularly in the frontal cortex of the brain. Gray matter volume seems to decline linearly with age whereas the white matter volume stays more constant. Males have higher peak volume and they also show faster decline rates. The reasons for the decline in brain volume are not known.