Here is one of the few studies to probe the relationship between air travel, childbirth, and retirement:
“The relationship between air travel behaviour and the key life stages of having children and entering retirement,” Lisa Davison, Tim Ryley [pictured here], Journal of Transport Geography, Volume 26, January 2013, Pages 78-86. The authors are at the University of Ulster and Loughborough University, UK.
(Thanks to investigator Tom Gill for bringing this to our attention.)