facts of life

Facts of life is a figurative phrase which refers to the undeniable truth about the unpleasant ways that the world works. Facts of life is often talking about the unfortunately unpleasant things that can happen to a person, how the society we live in may negatively impact our life, and the world as a whole not always being fair. The television show by the same now was about the same type of thing; that growing up is not always pleasant.