Queries on Ephesians 3

Ephesians 3
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6. Does εἴναι here express not the design but the subject and purpose, “that the Gentiles are?”
8. Is it just to draw from τῷ ἐλαχ. π. ἁ. not only the remembrance of the former persecution of the church but of his own sinful nature (1 Tim. 1:1515This is a faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief. (1 Timothy 1:15), εἰμί, not ἠν)?
9. How are we to understand ἀπὸ τῶν αἰώνων compared with Rom. 16:2525Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, (Romans 16:25) Cor. 2:7, as well as verse 11 following?
21. Does the last phrase take in eternity as well as the millennial age?