I use Psalm 90:10 as the generation spoke of. Take a close look at the wording in that verse and you may see the prophetic implication there. Especially the two different words translated as strength in the KJV.This is unsupportable, that number. Generations in the Bible are variously 20 years, 40 years, 70-80 years, 100 years, and 120 years, people make a case for all of those.
The parable of the fig tree was exactly what Jesus said it was, a parable. Luke quotes a similar parable from the discouse he recorded, Consider the fig tree, and all the trees. Another parable.
I think we went over this when I was discussing the blossoming fruit of the Judean Date palm.... if I remember correctly you do not think the fig tree is a symbol of Israel. The church is associated with oaks of righteousness. So when the Olivette discourse speaks of fig trees and the generation it is speaking of Israel, but when Luke adds all the trees he is speaking of the church as well. We too are bearing fruit, the coming latter rain..... a concept you do not agree with as well.... so it is a moot point to try and explain to you what you cannot see in scripture.... if you know what i mean?
You approach scripture and prophecy with your carnal human mind, with Logic, and temporal thought.... the wisdom of man. and in so doing you place your faith in that wisdom instead of reaching the point of saying "LORD, Thou knowest". As Good as Logic and reason are they will only take you so far in comprehending an almighty eternal God who is Spirit and operates in the Spiritual realm. That is the point in a way of this OP to begin with.... our minds work in a temporal realm constrained by the Laws of nature, and the time space continuum as God created. Us looking at God is like a 2 dimensional being trying to comprehend the 3rd dimensional beings.... I am sure you've heard the analogy I believe C.S. Lewis made. The Spirit of God reveals the deep things of God to us if and when we come to the point of being able to say "LORD thou knowest." When we lose faith in our own carnal earthly wisdom and can be taught by the Spirit.... Like little children.... faith of child.
The wisest people are the ones who are wise enough to know that they don't know it all.... we know in part.... The simple are the ones that think they have it all figured out. Or to quote Paul: "Let no man deceive himself. If any man among you seemeth to be wise in this world, let him become a fool, that he may be wise." 1 Corinthians 3:18