Without World War I, when would the Royal Navy retire its older protected cruisers?
Short answerProbably by 1918, or around 1920 at the latest.
NotesThe older protected-cruiser categories would not survive long under uninterrupted peacetime replacement. The estimate puts their final retirement around 1918, or by 1920 at the latest. This is an approximate fleet-level judgment and does not assign separate retirement dates to individual classes.