A LOAF OF BREAD, SOME OLIVE OIL AND THOU...

"Olive oils are a lot like wines. The olives that spawn them come in many
varieties and reflect qualities determined by the land, sun and water where
they grow...

Olive oil labels contain quite a bit of information, but not necessarily one of the most important pieces -- the age of the oil. The government does not require that olive oils state when the oil was pressed or bottled. Those that do include that information tend to be boutique brands.

What are the specific differences among olive oils, and how do the
differences affect their use? Are expensive oils worth the money? How much
can the consumer tell about an olive oil simply by reading the label on the
bottle? To answer these questions, we arranged an informal tasting of --
three high-priced, three midrange and three relatively inexpensive oils..."

Washington Post
via CR