30 Brain

Depressing brain news from Esquire, via Ohio.com:

The brain contains about 100 billion neurons, which begin to die at the rate of thousands each day sometime after age 30 and are never replaced.

Assuming an average loss of 2,000 per day, this shocking news means that by age 90, you'll only have 99.96 billion neurons left, and when you're one hundred and thirty seven thousand years old, you'll have no neurons left at all. Look for more details in the upcoming Book of Ages 137,000.

Of Matters Grey [ohio.com]
Top 20 Articles from Neuron Online [neuron.org]
What is a Neuron? [Neuroscience for Kids!]