When did the OOP principles change?

I have a stupid question - when did the Object-oriented programming principles change? In my childhood, I was told that there are three OOP principles: encapsulation, inheritance, and polymorphism. Now I get more and more articles about four OOP principles - one new came out eventually, it's called abstraction. One of the common definitions of abstraction: “An abstraction denotes the essential characteristics of an object that distinguish it from all other kinds of object and thus provide crisply defined conceptual boundaries, relative to the perspective of the viewer.” — G. Booch, Object-Oriented Design With Applications, Benjamin/Cummings, MenloPark, California, 1991. Is it really a principle, it seems like it the idea on which other principles was built.