Extremely hilarious.
Fanboys: some Blocks 1 will have to replaced in 5 to 10 years. Block 1s which were acquired in 2008 to 2013.
Reality: PAF still flying fighter jets it acquired in 1960s.
Its not too difficult to understand that first F-7PGs & Mirages will be retired (these are over 100 units in service today) . It can take upto 5 to 8 years for these ones to be retired. Then all the F-16s acquired in 1980s will be retired. Note Block-1s were aquired at the same time as F-16 block 52s, yet Jeff block-1s are much more versatile, anti-ship missions, air to ground cruise missiles, and now home grown BVR tested via the same block-1s. By all practical means Block-1s WILL remain in service till F-16 block 52s are in service. PAC invested so much effort in overhaul capacity for a reason. They will be overhauled, upgraded but won't go anywhere in most of your lifetimes.