True, that’s pretty standard for all older airframes in all countries, however that is mostly refurbishment and upgrades to internals such as electronics, countermeasures, fuel lines, crew comfort, navigation, and radar equipment. At the end of the day however, the airframes and their core designs along with major components are still woefully outdated.

Modernizations are basically just a band-aid on the problem, and only really done because its cheaper then designing a whole new airframe that will never be used due to its intended purpose.