It’s not clear from the Gospels how long Jesus preached. Most experts and scholars believe that Jesus’ ministry was a single year, while a significant minority believes that it was three years, using the Gospel of John as their reference and the mention of three Passovers. In fact, a little detective work allows us to put forward a more realistic estimate of the length of Jesus’ ministry.
Let’s start with the facts, as we know them. Jesus was born somewhere between 17 and 4 B.C., but our best bet is 6 B.C., given that he was born while Herod the Great still ruled, and given that he was at least two years old when Herod died. According to the Gospel of Luke, he began his ministry when he was “about 30 years of age” (3:23) and we know from the Gospel of John that he was preaching when he was less than 50 years of age (8:57). We also know that he started his ministry after being baptized by John the Baptist. Using these figures, we can see that he started his ministry sometime between 23 and 26 A.D. (e.g., If Jesus were born in 6 B.C. he would have been 30 years old in 24 A.D.). This time period corresponds to the time when John the Baptist was preaching . So far, so good.
Jesus was preaching right up until his death, and we know his death occurred while Caiphas was the high priest in Jerusalem, while Pontius Pilate was the Governor, but after John the Baptist was beheaded. All these dates are known. For example, John the Baptist was beheaded on the day that Herod Antipas celebrated his birthday, after his half brother, Philip, had died and after Herod had married his half brother’s wife, Herodias. We know that Philip died in 34 A.D., in the twentieth year of the reign of Tiberius. We know further that the defeat of Herod Antipas’ army in 36 A.D. was attributed to celestial punishment for his killing of John the Baptist. John the Baptist, then, died in 35 or 36 A.D., and most people mark the date as August 29, 35 A.D..
If Christ began his ministry between 23 and 26 A.D., and was still preaching in 35 or 36 A.D., it means that his ministry lasted at least 9 years, and possibly as many as 13 years at the time of John the Baptist’s death.
How much longer after the death of John the Baptist did Jesus live? Most people believe it was within the year, and in fact that seems to be true. From Josephus and other sources we know that both Caiaphas and Pilate were deposed in 36 A.D., and since both were in power when Jesus was crucified, it makes sense to date the crucifixion in the Spring of 36 .
Putting together Jesus’ birth (6 B.C.) and his death (36 A.D.) leads us to the conclusion that Jesus was 42 years of age when he died. If he began preaching about 30 years of age, his ministry lasted more than a decade, not a single year or even three years.
We know intuitively that it makes more sense that Jesus ministry lasted a long time. He traveled to many places, mostly on foot, and in those days, travel could be difficult, not merely because the roads were poor but also due to the number of brigands who frequented the main roads. Moreover he seemed to have attracted a large number of devoted followers, some wealthy supporters, and even had significant support within some of the opposition groups. In addition he apparently had a nation-wide network. Such accomplishments would have taken years, especially in those days. There was no “Larry King” in Jesus’ time.
The idea that Jesus was in his 40s when he died is supported by comments attributed to the Temple priests in John (2:19-20). Jesus said “Destroy this temple and in three days I will raise it up” and the response came: “It has taken 46 years to build this temple, and will you raise it up in three days?” Many scholars have noted the subtext in many (most/all) of Jesus sayings, and it cannot but tempt our interest to suggest that they were talking about Jesus himself when they said it took 46 years for him to live, and when he dies, he will be raised in three days.
As well, the comment of the Judeans from John: “You are not 50 yet, and you have seen Abraham?” (8:57) suggests a Jesus in his mid 40s. Certainly it doesn’t suggest a man in his early 30s.
Irenaeus, Bishop of Lyon, (130-202 A.D.) in his principal work Against Heresies, believed (on the basis of oral testimony from the disciples) that Jesus was nearly 50 when he died.
Isaac Asimov (1968) calculated that in 29 A.D. Jesus “must have been at least 33 years old, very likely 35, and just possibly even older.” (p. 802). Knowing that he died in 36 A.D., by Asimov’s calculations he would have been “very likely” 42 years old (35 + 7 (36 A.D.-29 A.D.)). Bloom (2005) put Jesus’ age at 40, correctly giving his birth at 6 B.C. but mistakenly putting his crucifixion at 34 A.D.
To summarize, Jesus was actively preaching from the time he was about 30 years of age until he was in his early to mid 40s, a period of more than 10 years. In that time he managed to grow a large and diverse group of followers who rivaled any of the contemporary religious groups in Israel at that time.
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