Some claim that Jesus was baptized at 30 years to show that all must receive at the similar age. Was it because Jesus the Lord God had attained the ‘age of reason’ only at 30 years old then? They fail to see that Jesus was circumcised at 8 days and in the NT, baptism replaces circumcision. Also, the baptism He received from John was the baptism of repentance different from the baptism Christians receive. Baptism is the NT circumcision and something performed by Jesus alone on others. He is the ‘one who baptizes with the Holy Spirit’.

The baptism of Jesus at the age of 30 years, was it because

1                     He had attained the age of reason at 30 years only

2                     He repented of his sins and wanted it washed away

3                     To receive the Holy Spirit

4                     To be filled with the Holy Spirit

5                     To belong to the church

6                     To be God’s people through God’s covenant with Abraham.

7                     To receive heirship to the promise of God to Abraham.

Lu:2:42: And when he was twelve years old, they went up to Jerusalem after the custom of the feast.Lu:2:49: And he said unto them, How is it that ye sought me? wist ye not that I must be about my Father's business?

Jesus was about His Father’s business evidently at 12 years old as seen in Luke 2:42, 49, not that He attained the age of reason only at 30 years of age.

Heb:4:15: For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin.

He did not need repentance and forgiveness as He was without sin.

He was the ‘child of the Holy Ghost’ at conception and the Son of God since the beginning. (Mt 1:18 & 20)

He is the body, the church.

He is God Himself.

He is before Abraham was.

The Lord was baptized, not to be cleansed Himself, but to cleanse the waters, so that those waters, cleansed by the flesh of Christ which knew no sin, might have the power of baptism. St. Ambrose of Milan (340-397AD) on Baptism
Mini-Bio: German; bishop, Doctor of the Church

The Lord’s baptism evidently in the Bible was the fulfillment of the prophecy of Isaiah. His anointing as the Christ, the anointed one’. The word is Hebrew and means "Anointed One." The Greek word for Messiah is Christos or "Christ."

Lu:2:21: And when eight days were accomplished for the circumcising of the child, his name was called JESUS, which was so named of the angel before he was conceived in the womb.

M't:12:18: Behold my servant, whom I have chosen; my beloved, in whom my soul is well pleased: I will put my spirit upon him, and he shall shew judgment to the Gentiles.

Lu:3:21: Now when all the people were baptized, it came to pass, that Jesus also being baptized, and praying, the heaven was opened, Lu:3:22: And the Holy Ghost descended in a bodily shape like a dove upon him, and a voice came from heaven, which said, Thou art my beloved Son; in thee I am well pleased. Lu:3:23: And Jesus himself began to be about thirty years of age, being (as was supposed) the son of Joseph, which was the son of Heli,

Lu:4:17: And there was delivered unto him the book of the prophet Esaias. And when he had opened the book, he found the place where it was written,Lu:4:18: The Spirit of the Lord is upon me, because he hath anointed me to preach the gospel to the poor; he hath sent me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised,Lu:4:19: To preach the acceptable year of the Lord.Lu:4:20: And he closed the book, and he gave it again to the minister, and sat down. And the eyes of all them that were in the synagogue were fastened on him.Lu:4:21: And he began to say unto them, This day is this scripture fulfilled in your ears.

Ac:4:27: For of a truth against thy holy child Jesus, whom thou hast anointed, both Herod, and Pontius Pilate, with the Gentiles, and the people of Israel, were gathered together, Ac:4:28: For to do whatsoever thy hand and thy counsel determined before to be done.

Ac:10:37: That word, I say, ye know, which was published throughout all Judaea, and began from Galilee, after the baptism which John preached; Ac:10:38: How God anointed Jesus of Nazareth with the Holy Ghost and with power: who went about doing good, and healing all that were oppressed of the devil; for God was with him.

M't:3:14: But John forbad him, saying, I have need to be baptized of thee, and comest thou to me? M't:3:15: And Jesus answering said unto him, Suffer it to be so now: for thus it becometh us to fulfil all righteousness. Then he suffered him.M't:3:16: And Jesus, when he was baptized, went up straightway out of the water: and, lo, the heavens were opened unto him, and he saw the Spirit of God descending like a dove, and lighting upon him:

Joh:1:6: There was a man sent from God, whose name was John.Joh:1:7: The same came for a witness, to bear witness of the Light, that all men through him might believe.Joh:1:8: He was not that Light, but was sent to bear witness of that Light.

Joh:1:29: The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world. Joh:1:30: This is he of whom I said, After me cometh a man which is preferred before me: for he was before me. Joh:1:31: And I knew him not: but that he should be made manifest to Israel, therefore am I come baptizing with water. Joh:1:32: And John bare record, saying, I saw the Spirit descending from heaven like a dove, and it abode upon him. Joh:1:33: And I knew him not: but he that sent me to baptize with water, the same said unto me, Upon whom thou shalt see the Spirit descending, and remaining on him, the same is he which baptizeth with the Holy Ghost. Joh:1:34: And I saw, and bare record that this is the Son of God.

Ac:13:24: When John had first preached before his coming the baptism of repentance to all the people of Israel.

Ac:19:3: And he said unto them, Unto what then were ye baptized? And they said, Unto John's baptism. Ac:19:4: Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus. Ac:19:5: When they heard this, they were baptized in the name of the Lord Jesus.

John the Baptist says, Christ is the one who baptizes with the Holy Spirit, the baptism in the name of the Father, Son and Holy Spirit. Christ was God and part of the Trinity (Jn 1:1). He does not require to be baptized as He was God Himself.  He had no sin in Him. He was born the Son of God. The Bible clarifies He is the child of the Holy Spirit. So of course He had the Spirit in Him when He came into the world. At the time of His birth itself it is clearly stated that He was born of the Holy Spirit and is the Son of God. He was man and God.  He received the baptism of John, not the baptism in the name of the Father, Son and Holy Spirit, so a different baptism from the one we now receive (Acts 18:25 & !9:2-4). He was baptized when He was 30 years old. Was this because He attained the age of reason only at 30 years of age? He was God, and the Bible earlier tells that at the age of 12 Jesus was going about with ‘his Father’s business’. His baptism was for a different purpose in itself. We receive baptism to be born of the Spirit, which is received from Christ and for the  cleansing us off original sin & other sins (where applicable), to join us to the New Covenant, to receive the new circumcision by the Spirit, to become sons of God, to join us to the body of Christ : the church, (to name a few). But was the baptism Christ received for any of the same reasons? Not at all. His baptism was for a different purpose in itself.

"Christ is baptized not to be made holy by the water, but to make the water holy, and by his cleansing to purify the waters which he touched ... For when the Savior is washed, all water for our baptism is made clean, purified at its source for the dispensing of baptismal grace to the people of future ages" (Saint Maximum of Turin).

"He chose to bury sinful humanity in the waters. He comes to sanctify the Jordan for our sake and in readiness for us; he who is spirit and flesh comes to begin a new creation through the spirit and the water" (Saint Gregory of Nazianzus).

When John objects that it is he who should instead be baptized by Jesus, the Savior replies: "Allow it for now, for thus it is fitting for us to fulfill all righteousness." Thus does Jesus manifest the full extent of that "emptying out" of his divine dignity upon coming into the world (Phil 2,7). Jesus "who knew no sin was made sin for us" (Roman Breviary) so that we might escape the condemnation due our sins through baptism which he our Lord will give. Though free of every sin, he fulfills all righteousness for us the Church, which will come to birth by water and the Holy Spirit, his sacramental gift of baptism.

Jesus went through His phases in life as a baby and His infancy as one with the Holy Spirit. His baptism was His anointing as John and the prophecy of Isaiah says.

Christ Reigns!!