More on Panton Gates from Infoplease:

• Panton Gates - Panton Gates Old as Panton Gates. A corruption of Panton Gates at Newcastle-on-Tyne. Source: ...
• Old as the Hills - Old as the Hills “Old as Panton Gates.” (See Panton Gates.) Source: Dictionary of ...
• Dictionary of Phrase and Fable: P - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "P"