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. Author manuscript; available in PMC: 2011 Apr 1.

Published in final edited form as: Aging Cell. 2009 Dec 23;9(2):273–284. doi: 10.1111/j.1474-9726.2009.00542.x

Left: Individuals decline in condition until death (*), which is often a direct consequence of reduced performance in old age. Right: Individuals maintain a high level of condition into old age, but die with increasing probability at older ages from catastrophic causes. Ages at death are the same in both panels.

Left: Individuals decline in condition until death (*), which is often a direct consequence of reduced performance in old age. Right: Individuals maintain a high level of condition into old age, but die with increasing probability at older ages from catastrophic causes. Ages at death are the same in both panels.