How old... is old?

Deventer is >1100 years older than our hometown, San Mateo.  Deventer celebrates its 1250th anniversary this year:

1250 years creates a very different perception of what it means to be "old".  As an example, here is a paraphrased conversation among our landlady (Y), Katie (K) and me (S) yesterday.

Y: Try this cheese, you will like it, it is called "Bunker Cheese"... because it is aged in an old bunker.

S: An old bunker from World War II?

Y: No, sort of an older bunker. With a line.

K: Oh, the Maginot line. A bunker from World War I.

Y: No, a sort of an older bunker than that.

S: Oh, from the Napoleanic Wars.

Y: No, a kind of an older bunker really. About flooding the land. 

K: Oh, the 16th century revolt against Philip II of Spain?

Y: Well possibly, but maybe a bit older.

It's paraphrased, but pretty much verbatim.  For something to be considered "old" here...  it needs some serious years.