Arcana Coelestia#738
738. He is called 'a son of six hundred years' here because, as shown already, 'son' means intellectual truth. He is not however referred to as a son in verse 11 below because there the subject is his temptation as regards things of the will.
Colossians 3:10
10
And have put on the new man, which is renewed in knowledge after the image of him that created him: