The human brain develops rapidly from conception to age six, accretes lipids and proteins until age 12-13, and begins to atrophy in the 60s.

“the brain develops rapidly from conception to possibly three to five years and by by the age of six the human brain is almost fully developed and then you start slowly accreting accretion refers to retention of lipids and material such as protein and the structure of the brain where it's not exchanging with plasma anymore or blood so it's kind of stuck in the brain so the accretion of lipids or omega-3s in the brain slows considerably between the ages of 6 all the way to 12 and 13. and then beyond that the pools are relatively stable and expansion of brain size is very slow and then after certain age cutoffs like 60s and above you start seeing the opposite where atrophy starts to happen with aging”