Table 7. Pairwise Pearson’s correlations of age milestones for NASA astronauts over all selections (1959–2013).

	Age at Selection	Age at First Flight	Age at Last Flight	Age at Retirement
Selection Year	0.391***	0.222***	0.202***	0.106*
Years from Selection to First Flight	-0.026	0.631***	0.333***	0.310***
Years from First Flight to Last Flight	-0.144**	-0.296***	0.529***	0.509***
Years from First Flight to Retirement	-0.165**	-0.247***	0.393***	0.758***
Years from Selection to Last Flight	-0.154***	0.151***	0.739***	0.661***
Years from Last Flight to Retirement	-0.105	-0.081	0.057	0.647***
Years from Selection to Retirement	-0.133**	0.110*	0.557***	0.885***

*** p<0.01,

** p<0.05,

* p<0.1