Is there a logic behind the RAF's decision?
Avoiding lawsuits?
Someone aged 27 could have demonstrably better aptitude test results than an NCA bod aged 31, but the 27 yr old would be turned down on the spot for no reason other than he's late to the party.
Appreciate the Armed Forces don't work to the same employment laws as other sectors of work, but that won't last forever. They're just covering their own backs.