Get this: life expectancy has apparently hit its peak. According to msn.com, a recent study published in the journal Nature Aging finds that, barring any major medical breakthroughs, “people will top out at a maximum average age of around 87 — 90 for women, 84 for men.” This news runs counter to numerous more optimistic studies I’ve written about the past 20 years. Back in 2003, I wrote about f…