As old as the world; very old; reaching back through the ages.
The Century Dictionary (Public Domain)
Use "world-old" in a sentence
"Whether known as Communism or Socialism or what not, these efforts are neither new nor strange nor terrible, but world-old and seeking an absolutely justifiable human ideal—the only ideal that can be sought: the direction of individual action in industry so as to secure the greatest good of all."
"We looked at him clearly, with world-old eyes, and saw simply a human thing, weak and pitiable and cruel, even as we are and were."
"Always Africa is giving us something new or some metempsychosis of a world-old thing."