I don't know how old is this door, actually. If it is the original, it means more than 600 years.
It's possible, as this kind of wood is really lasting, and the general style and execution is much in the style of the time where the church was built, at the 14th century.
You can see the remainings of other ornaments in the upper right side, and the cut to make the door easier to open that is more recent I guess, so I can say it has a long story behind it.