Two-thirds of those living today weren't yet born when the oldest operating commercial nuclear power plants came online. The aging of the world's nuclear reactors is drawing increasing public attention, with closures announced in the U.S. and a global tightening of safety and security measures following the March 2011 disaster in Japan. Click ahead to see the world's oldest operating plants.
The Beznau-2 reactor, pictured during renovations in September 2011 in Doettingen, Switzerland. Beznau Units 1 and 2 went into operation in 1969 and 1971, respectively.
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