Correct, and not only that; their definition of this generation does not fit the number of years that elapsed. Caiaphas probably died in 36AD and Annas in 40 AD. Mothers had their children fairly young. While I grant the godly could live a long life, that would not logically apply to the scenario of the preterist having a generation for judgment in 70AD. Although it is possible some of the Sanhedrin that tried Yeshua could have been alive in 70AD (the youngest member may have been about 40 in 33AD/CE), it is unlikely that very many would have lived that long unless perhaps they had become believers. However, there is a strong Scriptural argument for interpreting this generation as having applied to 70AD/CE that just dawn upon me. Forty hears after Yeshua's ministry began would be about 70AD/CE. This generation could have meant all those who were of the age twenty and upwards on or about 30AD/CE and had the opportunity to hear the Gospel. Forty years elapsed until 70AD/CE when they had either endured to the end in faith or perished in the First Jewish-Roman War. That generation of forty years was judged.
- For the children of Israel walked forty years in the wilderness, till all the people that were men of war, which came out of Egypt, were consumed, because they obeyed not the voice of the LORD: unto whom the LORD sware that he would not shew them the land, which the LORD sware unto their fathers that he would give us, a land that floweth with milk and honey.
- Harden not your heart, as in the provocation, and as in the day of temptation in the wilderness: When your fathers tempted me, proved me, and saw my work. Forty years long was I grieved with this generation, and said, It is a people that do err in their heart, and they have not known my ways: Unto whom I sware in my wrath that they should not enter into my rest.
- Wherefore (as the Holy Ghost saith, To day if ye will hear his voice, Harden not your hearts, as in the provocation, in the day of temptation in the wilderness: When your fathers tempted me, proved me, and saw my works forty years. Wherefore I was grieved with that generation, and said, They do alway err in their heart; and they have not known my ways. So I sware in my wrath, They shall not enter into my rest.) Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God. But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin. For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end; While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation. For some, when they had heard, did provoke: howbeit not all that came out of Egypt by Moses. But with whom was he grieved forty years? was it not with them that had sinned, whose carcases fell in the wilderness? And to whom sware he that they should not enter into his rest, but to them that believed not? So we see that they could not enter in because of unbelief.
That still falls short. This generation was to have witnessed by all the world the Lord coming in the air just as He ascended to heaven.