If you think getting old today is a bummer, imagine when really old was 45, and 50 was ancient. Rulers of kingdoms acted like spoiled teenagers because they were spoiled teenagers.
During the 14th century (1300s) — the worst of the Black Plague years — many of the warring monarchs were not yet out of their teens. Fifteen, sixteen, seventeen year-old kings waging war. Hormonal tyrants, the anointed of God, doing whatever they wanted (unless they got so far out of hand that their own family did them in).
So, my friends, gather ye rosebuds while ye may. Time is still a-flying.
Robert Herrick was a 17th-century English poet and cleric, best known for his poem To the Virgins, To Make Much of Time, generally know by its first line Gather ye rosebuds while ye may.