I can't tell you the age, but it's obvious you bought it. What do you think of it, and how did it shoot?
On the "other" Weatherby site I visit Weatherby Collectors is a fellow by the name of Jim who posts as "westhunt". He's on the board of directors with the Weatherby Collectors Association and is a wealth of knowledge. He provided me with the years my Weatherby's were made, down to within a year. Might be a good bet to make a post there.
Congrats on your purchase