Feeling over-the-hill at 40? Cheer up. For a while.
Apr 23, 2012 - 6:25 pm
Most animals, from shrimp to shrews, decline swiftly after reaching sexual maturity. Humans, on the other hand, experience middle age: a several-decade plateau during which most biological systems deteriorate very little. This stage of life, argues writer and zoologist David Bainbridge in this excerpt from Middle Age: A Natural History, represents a remarkable evolutionary achievement that should gratify, not depress.