When I was growing up, a popular folk song written and recorded by Pete Seeger lamented “Where have all the flowers gone?”  with the line, “When will they ever learn; when will they ever learn.” The second verse delighted feminists when it asked: “Where have all the young girls gone” before answering: “Taken husbands every one” and lamenting that girls never learn – which probably explains both the age of hippies and the age of Aquarius.