Ephesians Two

Ephesians 1:[13] In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,
[14] Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.

The sealing of the Holy Spirit comes the moment you believe and guarantees your salvation until you are taken from the world.

[15] Wherefore I also, after I heard of your faith in the Lord Jesus, and love unto all the saints,
[16] Cease not to give thanks for you, making mention of you in my prayers;
[17] That the God of our Lord Jesus Christ, the Father of glory, may give unto you the spirit of wisdom and revelation in the knowledge of him:
[18] The eyes of your understanding being enlightened; that ye may know what is the hope of his calling, and what the riches of the glory of his inheritance in the saints,
[19] And what is the exceeding greatness of his power to usward who believe, according to the working of his mighty power,
[20] Which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly places,

This age began with the Resurrection of Jesus. He now sits at the right hand of the Father awaiting until the time of removing the church from the world and the beginning of the next age. (NOTE: In Revelation chapter four verse one when John is taken to Heaven the Son is not sitting at the right hand of the Father further proof that this is the Rapture of the church represented in Rev. 4:1)

[21] Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come:
[22] And hath put all things under his feet, and gave him to be the head over all things to the church,
[23] Which is his body, the fulness of him that filleth all in all.

There will be ages to follow this current age of grace. There will be a new world over which Christ will rule supreme.

Ephesians 2:[1] And you hath he quickened, who were dead in trespasses and sins;
[2] Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience:
[3] Among whom also we all had our conversation in times past in the lusts of our flesh, fulfilling the desires of the flesh and of the mind; and were by nature the children of wrath, even as others.
[4] But God, who is rich in mercy, for his great love wherewith he loved us,
[5] Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved;)
[6] And hath raised us up together, and made us sit together in heavenly places in Christ Jesus:

Not only our own individual past but gentiles of past ages walked according to the devils pleasure worshipping idols and walked as those at the time of Noah.

[7] That in the ages to come he might shew the exceeding riches of his grace in his kindness toward us through Christ Jesus.
[8] For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
[9] Not of works, lest any man should boast.
[10] For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.
[11] Wherefore remember, that ye being in time past Gentiles in the flesh, who are called Uncircumcision by that which is called the Circumcision in the flesh made by hands;
[12] That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world:

There is not only a new world to come but also ages (plural).
As in no other time in history the Grace of God is manifested bestowed upon His body the church. The full blessing of this is not realized until the future. It is the responsibility of Christians to manifest this grace to those around us by our treatment of others.
The divergence of humanity beginning with the calling of Abraham having been given the seal (just as we are now given the seal of Holy Spirit circumcision) dividing humanity between Circumcision and Uncircumcision. The age of law further divided humanity in these two catagories as God dealt with the world through the nation of Israel and revealed to humanity His divine nature through the law.

[13] But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ.
[14] For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us;
[15] Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace;
[16] And that he might reconcile both unto God in one body by the cross, having slain the enmity thereby:
[17] And came and preached peace to you which were afar off, and to them that were nigh.
[18] For through him we both have access by one Spirit unto the Father.
[19] Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God;
[20] And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone;
[21] In whom all the building fitly framed together groweth unto an holy temple in the Lord:
[22] In whom ye also are builded together for an habitation of God through the Spirit.

Now the dispensation of the law is over having made peace between humanity and God by taking the law to the cross. We now being born again having been born of the Holy Spirit. Jesus having torn the veil to the Holy of Holies and opened the door for us giving us access to the Father and the grace wherein we stand. Now we see no temple in Jerusalem having been made a living breathing temple for God through the indwelling of the Holy Spirit.

Times Past
The Adamic Covenant life by not eating of the tree.
The Noahic Covenant life by getting on a boat
The Abrahamic Covenant life by blessing Israel and living according to the conscience God gave man
The Mosaic Covenant life by obeying the law

Times Present
The Grace Covenant life by accepting the atoning death of Jesus Christ our Lord

Ages to Come
The Tribulation Covenant life by refusing the mark and being martyred
The Millennial Covenant by obeying the law and worshipping Jesus on the throne at Jerusalem.

Being the eighth and a new beginning where access to the tree of life determined by works.