EXCERPT: A. E. Housman's lyric, "When I was one-and-twenty," appears as #XIII in Housman's collection titled, A Shropshire Lad, along with "To an athlete dying young," which offers a view point regarding death. In Housman's "When I was one-and-twenty," the speaker at age twenty-two reports the truth of sage advice he received at age twenty-one about falling in love.
https://owlcation.com/humanities/A-E-Housmans-When-I-was-one-and-twenty