Comments on: Interventive Gerontology 1.0.02: First, Try to Make it to the Mean: Diet as a life extending tool, Part 1. A revolution in time. Thu, 11 Apr 2013 01:11:28 +0000 hourly 1 By: zeb zeb Tue, 29 Nov 2011 21:02:13 +0000 It seems that average life expectancy is a tricky concept for many. Life expectancy DOES NOT equal mean lifespan. In 2007 US life expectancy stood at 78.3 yet the age that 50% are expected to reach were 82.2 years (mean lifespan). Life expectancy is always distorted by early-life mortality. Around 60% reach the life expectancy age. Do not confuse average with mean.