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.
Great man and rich man
In Revelation 6:15, this signifies respectively people who are in goods and people in knowledges of truths. (Apocalypse Revealed 337)