four score and seven years ago

Etymology
lit. '87 years ago' ( sense: “group of 20”) the beginning of the made on November 19, 1863, by United States President  (1809–1865). The widespread familiarity of Lincoln’s address, the unusual and poetic wording, and its status as the first words of the speech have caused the phrase to enter the public consciousness.

Adverb

 * : a long time ago; many years ago.