Many web-sites claim that Einstein's brain was smaller than average. For example, in this 2005 phys.org article:
Einstein’s brain weighed only 1,230 grams, less than the average adult brain which weighs about 1,400 grams.
However, this figure was measured after his death when he was 76 years old, and brains shrink with age.
Is 1,230 grams less than the weight of the average 76-year-old's brain?