"Age of Reason" is a song by Australian pop rock singer John Farnham. It is the first single from his album of the same title, released in 1988, and written by Todd Hunter and Johanna Pigott.

The single was used in a promo for Australia's Seven News in 2000.

"Age of Reason" was composed by Todd Hunter and partner Johanna Pigott, who had previously written the song "Rain" for Dragon and played together in the XL Capris. Pigott said, "You write songs and you're surprised at what you wrote sometimes, and you think, goodness, is that me, did I do that? It's not something you consider of perfect taste or anything, and someone records them and you think that's fantastic. It's a really exciting and thrilling thing."

The music video for "Age of Reason" was filmed in 1988 and included six key scenes with the Victorian Children's Choir in three of the sequences, running through a scrap metal yard, running down a hill behind John Farnham and finally, standing in a warehouse as Farnham walks between them.

In the "making of" feature included on the One Voice: The Greatest Clips DVD, Farnham can be seen singing with the children after the film clip wraps shooting in the warehouse. They each received a copy of the track on vinyl.

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