Age 50 or 30 years
Seems odd for the army to be asking this type.of question as they are put out to pasteurised at an early age, Commissioned or not.
As far as I remember, you need to have served 30 years or be 50 and older, whichever comes first. tdf can easily answer any nuances, but I'm pretty sure it's governed by QRs and not a JSP.