I inherited a couple of copies from my elder brothers in about 1970, one was the '64 edition, the other a compendium of civil aircraft, both became very well thumbed to the point of destruction over the next several years as my interest in aircraft (fostered by the Pater) developed.
New edition was my birthday present each year from 1974 onwards until around the time they went paperback... Since then I've acquired quite a few editions form the 50s, 60s and early 70s.
William, many thanks for a wonderful reference source for little boys of any age!