The fact that engineers are being hired doesnt mean anything unfortunately. Im not saying I dont think they will keep the base, because I think they will.
As far as the age limit is concerned, im 99% sure that the age limit is 33. And actually you can be 33, but not 34.. So its all ages up to and including 33 years of age. Last year maybe they changed it to 31 because they had alot of applicants. If Aegean were to hire low houred pilots again though, im positive they will make their requirments more restrictive, simply because they are aware of the fact that there are ALOT of low time pilots in Greece right now without jobs, and that every single first officer from Cyprus will also apply, because CY isnt doing too well right now. They clearly cannot sustain having to test 300+ pilots...