The below is from an EXCELLENT article I just read on what is a Biblical Generation. It shows that a Biblical Generation is 40 to 50 years using precise Biblical verses. This makes sense in the context that Jerusalem stopped being trampled on by the Gentiles on June 7, 1967.
Notice that June 7, 1967 + 40 to 50 years lands in the vicinity of 2007 – 2017 when all must be fulfilled. If 360 day years are used, this brings it back to 2016!!
What this means is that we are ALMOST there, folks. MARANATHA!! SOON WE WILL MEET IN THE SKY!!
Jewish children begin studying the torah at age 5.
I remember when our non-Messianic Jewish tour guide in Israel was asked "how long is a biblical generation?" he DIDN'T EVEN BAT AN EYE and instantly replied "a generation in the Bible is 40 years".
The Hebrew word for "generation" is dor and the Greek is genea.
O.K., here's what I've done: I've taken EVERY biblical passage that CLEARLY assigns A SPECIFIC NUMBER OF YEARS TO a "generation" or "generations", and listed it below:
1: Job 42:16:
"After this, Job lived 140 years; he saw his children and their children to the fourth GENERATION".
We know that Job was an adult and thus capable of immediate reproduction.
We don't know how old that fourth generation he got to see was, but they were probably children or at most, teenagers. If we divide 140 by 4 we get 35.
If we divide by three, we get 46.5 years.
If we split the difference down the middle, that's VERY CLOSE to 40 years (40.75, to be exact).
2. Matthew 1:17:
"So all the generations from Abraham to David are fourteen... And from David to the carrying away to Babylon fourteen... and from the carrying away to Babylon to Christ are FOURTEEN GENERATIONS".
We don't know the exact number of years from Abraham to David, or even from David to the Babylonian captivity, but we do know the exact year of captivity to be 586 B.C., and the year of Messiah's birth to be 1 B.C.
Since Matthew tells us there were 14 GENERATIONS between the two, all we have to do is divide 584 into 14 (586 - 2 (there's no "year zero") = 584 / 14) = 41½ years: Still VERY CLOSE.
3. Luke 21:6, 20 and 32:
Jesus said, in April of 32-33 A.D., that THAT GENERATION would NOT PASS AWAY without Jerusalem and the temple being destroyed. It happened, right on cue, in July-August, 70 A.D., 38 years (and approximately 4 months) later. About a year and 8 months short of 40 YEARS.
4. Acts 13:36:
"For David, after he had served HIS OWN GENERATION... fell asleep..."
And how long did David serve HIS GENERATION? The answer is found in 2 Samuel 5:4 "David was 30 years old when he began to reign, and he reigned 40 YEARS".
5. Numbers 32:13:
"... and He made them wander in the wilderness FORTY (40) YEARS, until ALL THE GENERATION, that had done evil in the sight of the Lord was consumed".
6. Psalm 95:10:
"For 40 YEARS I was grieved with THIS GENERATION, and said, it is a people that do err in their heart, and they have not known my ways".
7. Hebrews 3:9-10:
"when your fathers tempted me and proved me and saw my works 40 YEARS. Wherefore, I was grieved with THAT GENERATION".
The Bible only requires TWO witnesses for every matter to be established (Deuteronomy 19:15).
I just gave you SEVEN.
One more thing: If we take Jesus' genealogy in Matthew chapter 1 (from Abraham to David, David to Babylonian captivity, and Babylon to Jesus) as being 42 GENERATIONS (14+14+14) and divide the approximate time from Abraham to Jesus which is estimated to be about 2,100 years by 42, it equals 50.
Therefore, if a generation is AT LEAST 40 years, but NO MORE THAN 50 years, and Jerusalem returned to the Jews 45 years ago, and Jesus, per His own words MUST RETURN before THIS GENERATION passes away, that means that Jesus' return must be VERY, VERY, VERY NEAR.
If His Second Coming, as per Daniel 9:25, happens 49 years FROM "the word" to return and build biblical Jerusalem given in 1967, indeed, as our Lord said in Luke 21:32 THIS generation will NOT have "passed away" until ALL these things (Rapture, tribulation, Second Coming) have taken place.
It means that both timelines are IN AGREEMENT. It means that WE ARE THE GENERATION that will witness His glorious return.
Amen. Please come, Lord Jesus!
As we have seen, the length of A BIBLICAL GENERATION is NO BIG MYSTERY: all we need to do is READ THE SCRIPTURES.