I don't believe I've ever questioned either candidates about service time (and if I did, it may have had a sharp edge on it out of spite 

 ), but Midnight is right.  Wasn't it Maslow that had a theory that every 10 years or so you change.  I remember the theory but not the psychologist, simply because I had a psych teacher that said jokingly 
"When you turn 30, you're more inclined to have babies (if you haven't already) or 'Save the Whales' "  LOL! 