In some verses Jesus was speaking of Himself. We know when Jesus was speaking of Himself since we can connect these verses with what we know Jesus did on His earthy mission.
Mark 2:10 But so that you may know that the Son of Man has authority on earth to forgive sins - he said to the paralytic
Mark 2:28 So the Son of Man is Lord even of the Sabbath .
Matthew 8:20 And Jesus said to him, "Foxes have holes and birds of the air have nests, but the Son of Man has nowhere to lay his head.
Luke 19:10 For the Son of Man has come to seek and to save that which was lost.
From looking at the context we know if Jesus was speaking about Himself or referring to another man.
Look carefully at Mark 8:38. Look at how the verse is separated by a semicolon and Jesus says “also” indicating that the Son of man is
someone other than Himself who would come
in the glory of his Father with the holy angels
Mark 8:38 Whosoever therefore shall be ashamed of me and of my words in this adulterous and sinful generation; of him also shall the Son of man be ashamed, when he cometh in the glory of his Father with the holy angels.
of him also, when he cometh means there is another man involved.
Look carefully at Luke 9:26. Look at how
Jesus separated Himself from the Son of man (ashamed of me, of him shall), and then Jesus said that the Son of man shall come in
his own glory and in His Father’s glory. Jesus did not say that the Son of man will come
in my glory.
Luke 9:26 For whosoever shall be ashamed of me and of my words, of him shall the Son of man be ashamed, when he shall come in his own glory, and in his Father’s, and of the holy angels.
ashamed of me and of my words, of him shall means there is another man involved.
The age to come will be
after Christ returns, and that is
The Day of Judgment (see below).
The end times (end of an age) came when Christ returned.
The Bible does it say when during the new age the Kingdom of God will be 'fully built.'
The Day of Judgment
Christ spoke much in parables about a great Day of Judgment when “the Son of man shall come in the glory of his Father … and … shall reward every man according to his works” (Matt. xvi, 27). He compares this Day to the time of harvest, when the tares are burned and the wheat gathered into barns:—
… so shall it be in the end of this world [consummation of the age]. The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity; And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth. Then shall the righteous shine forth as the sun in the kingdom of their Father.—Matt. xiii, 40–43.
The phrase “end of the world” used in the Authorized Version of the Bible in this and similar passages has led many to suppose that when the Day of Judgment comes, the earth will suddenly be destroyed, but this is evidently a mistake. The true translation of the phrase appears to be “the consummation or end of the age.” Christ teaches that the Kingdom of the Father is to be established on earth, as well as in heaven. He teaches us to pray: “Thy Kingdom come, Thy will be done on earth as it is in heaven.” In the parable of the Vineyard, when the Father, the Lord of the Vineyard, comes to destroy the wicked husbandmen, He does not destroy the vineyard (the world) also, but lets it out to other husbandmen, who will render Him the fruits in their season. The earth is not to be destroyed, but to be renewed and regenerated. Christ speaks of that day on another occasion as “the regeneration when the Son of man shall sit in the throne of his glory.” St. Peter speaks of it as “the times of refreshing,” “the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.” The Day of Judgment of which Christ speaks is evidently identical with the coming of the Lord of Hosts, the Father, which was prophesied by Isaiah and the other Old Testament prophets; a time of terrible punishment for the wicked, but a time in which justice shall be established and righteousness rule, on earth as in heaven.
In the Bahá’í interpretation, the coming of each Manifestation of God is a Day of Judgment, but the coming of the supreme Manifestation of Bahá’u’lláh is the great Day of Judgment for the world cycle in which we are living. The trumpet blast of which Christ and Muhammad and many other prophets speak is the call of the Manifestation, which is sounded for all who are in heaven and on earth—the embodied and the disembodied. The meeting with God, through His Manifestation, is, for those who desire to meet Him, the gateway to the Paradise of knowing and loving Him, and living in love with all His creatures. Those, on the other hand, who prefer their own way to God’s way, as revealed by the Manifestation, thereby consign themselves to the hell of selfishness, error and enmity.
That's right. The Holy Spirit can work through people besides prophets, but it is sent directly to prophets and then reflected off those other people.
The focus of the rays of the Holy Spirit was Christ, and from Christ the Holy Spirit reflected upon the Apostles, who mirrored forth the Holy Spirit. As that passage I quoted said, the descent of the Holy Spirit upon the Apostles means that the glorious divine bounties reflected and
appeared in their reality, which is their soul. Baha'is do not believe that the Holy Spirit lived inside their bodies, because the Holy Spirit does not descend into the body.
This short chapter explains how Baha’is believe the Holy Spirit descended upon the disciples of Christ:
24: THE DESCENT OF THE HOLY SPIRIT UPON THE APOSTLES