CVA-01's likely service life and replacement

If Britain had built CVA-01, would the carriers still be serving at the time of this discussion?

Possibly, but replacements would be more likely after a career of roughly forty years.

A CVA-01 built in the 1960s or 1970s is estimated to have a service life of roughly forty years. Continued service at the time of this discussion is entertained briefly, but replacement is considered more likely. The Invincible class provides the comparison for the broad retirement period.