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.
Jeremiah 10:12
12
He hath made the earth by his power, he hath established the world by his wisdom, and hath stretched out the heavens by his discretion.