The church guidebook mentions that this yew was planted in 1612, when James the First was king. Aging trees is always difficult without counting the growth rings, however estimates are possible. The work of suggests that with a girth of 340 cm this tree is likely to be 300 years old.
For more details on yew trees, including mythology, ageing and ancient yews go to www.ancient-yew.org
If you have a photo of this tree, maybe on your wedding day, then do let us know.