How do brains degenerate with age?

So far as I know, like the functions of the brain, aging is mostly a mystery (human aging is a mystery overall, anyway). read more

At 20 years of age, brain weight of male is on average 1400 g, and by age 65 it is about 1300 g. Females' brains follow a similar trend, although the total weight is 100-150 g less than that of males. Most changes occur after age 55. With a total loss of up to 15% of the peak brain weight by age 90. Atrophy of brain tissue also occurs with age. read more

Brain tumors can be either malignant or benign (noncancerous). Doctors classify brain tumors as grades 1, 2, 3, or 4. Higher numbers indicate more aggressive tumors. The cause of brain tumors is largely unknown. They can occur in people of any age. Symptoms of brain tumors depend on the size and location of the tumor. read more