Current measurement by Jeroen Pater. It is likely to be rather more than 1000 years old.
The girth of the tree is 9.30 m measured at a height of 30 cm (1999, Jeroen Pater). Its height is not known. This tree was planted in 1000, which makes it exactly 1015 years old (Jeroen Philippona, Oct 1, 2011).