here is the authenticated info about age relaxation

7. Age Concession:- This is given in the upper age limits as under:-

(a) Three to candidate from zone-1 and 3

(b) Period of service under Government. If terminated for want of vacancy.

(c) In case of Ex-Armed Forced Personnel, the entire period of service in Armed Forces or 10 years, whichever is less.

(d) Special concession mentioned in the advertisement



means zone 1 people get 3 years relaxation

and following is the link of kpk psc website
check it

Khyber Pakhtunkhwa Public Service Commission | Form Filling