Wikipedia says Smaug drove the dwarves out of their mountain stronghold 150 years prior to the events of The Hobbit. But it doesn't mention his age.
TolkienGatewayTolkien Gateway says Smaug's birthyear is unknown.
The book, Creatures of Middle Earth, mentions Smaug survived the destruction of Angband at the end of the First Age and settled at Anvilmount in the Grey Mountains.
Are there any canon references to Smaug's age?