Better to compare them with USN carriers. How long will Kitty Hawk have been in service when she retires/gets given to the Indians?
Ark Royal was a wartime build and the quality was pretty poor apparently. Victorious had her career cut short due to fire in a galley (excuse for early retirement) but generally speaking all the post WW2 carriers were just to small to operate modern jets.
Generally speaking, the bigger the hull, the longer she'll last.