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. 2017 Jul 27;12(7):e0181381. doi: 10.1371/journal.pone.0181381

Fig 6. Ages of NASA astronauts at time of selection for all selections from 1959 to 2013.

Fig 6

Dashed vertical lines represent each selection group in time, the mean age is plotted in black, and 95% confidence intervals are shaded in gray. Relevant events in NASA’s history are noted above the plot via red triangles. A: Skylab Flight Start (1973); B: Apollo Program End (1975); C: Skylab Flight Ends (1979); D: Space Shuttle Era Start (1981); E: Challenger Accident (1986); F: Columbia Accident (2003); G: Space Shuttle Era End (2011).