There is no formal educational requirement, but as a Navigation groundschool instructor I would recommend you pay attention in maths lessons! Maths up to GCSE level is an essential part of this and other ATPL exams and it is helpful if you know the maths already.
Assuming Cyprus is already JAA-compliant you will have to be 16 to fly solo, 17 to hold a PPL, 18 to hold a CPL and 21 to hold an (unfrozen) ATPL.
Best of luck!