For years biologists have figured the aging process is so complex it must involve thousands of genes, too many to offer an effective targeted therapy.

FORBES: On The Cover/Top Stories

The U.S. continues to spend several billion dollars each year to maintain the nuclear weapon complex and the aging stockpile.

CENTERFORSECURITYPOLICY: Center For Security Policy

Part of the problem, according to the IG, is that the facilities of the nuclear weapons complex have been aging and need increased spending for maintenance and replacement.

CENTERFORSECURITYPOLICY: Center For Security Policy

"It is pure science fiction to say we can change the rate of aging in an organism as complex as ours, " argues Thomas Perls, a geriatrician at Boston University Medical Center who studies centenarians.

FORBES: Researchers are unlocking the mysteries of aging.