This passage presents interesting challenges. The wisdom Paul speaks is not of this age, it is from older ages. The wisdom has been hidden and secret.6 Yet among the mature we do speak wisdom, though it is not a wisdom of this age or of the rulers of this age, who are doomed to perish. 7 But we speak God’s wisdom, secret and hidden, which God decreed before the ages for our glory. 8 None of the rulers of this age understood this; for if they had, they would not have crucified the Lord of glory. 9 But, as it is written,
“What no eye has seen, nor ear heard,
nor the human heart conceived,
what God has prepared for those who love him”—
10 these things God has revealed to us through the Spirit; for the Spirit searches everything, even the depths of God.
But, we are told that the Lord was apparently crucified by the rulers of this age.
The key question here is, how does Paul define the ages? When did the current age start? The fact that Paul (and many others) believed that the current age was coming to an end indicates that the current age is quite old. But how old?
This event must be something that happened long ago. It was "written down to instruct us." This is talking about something that happened during the time of Moses though. Does this mean literally that Christ was there at this time, or something else?1 Cor 10:
9 We must not put Christ to the test, as some of them did, and were destroyed by serpents. 10 And do not complain as some of them did, and were destroyed by the destroyer. 11 These things happened to them to serve as an example, and they were written down to instruct us, on whom the ends of the ages have come.
1 Cor 10: 1 I do not want you to be unaware, brothers and sisters, that our ancestors were all under the cloud, and all passed through the sea, 2 and all were baptized into Moses in the cloud and in the sea, 3 and all ate the same spiritual food, 4 and all drank the same spiritual drink. For they drank from the spiritual rock that followed them, and the rock was Christ. 5 Nevertheless, God was not pleased with most of them, and they were struck down in the wilderness.
Numbers 21:
4 From Mount Hor they set out by the way to the Red Sea, to go around the land of Edom; but the people became impatient on the way. 5 The people spoke against God and against Moses, “Why have you brought us up out of Egypt to die in the wilderness? For there is no food and no water, and we detest this miserable food.” 6 Then the Lord sent poisonous serpents among the people, and they bit the people, so that many Israelites died. 7 The people came to Moses and said, “We have sinned by speaking against the Lord and against you; pray to the Lord to take away the serpents from us.” So Moses prayed for the people. 8 And the Lord said to Moses, “Make a poisonous serpent, and set it on a pole; and everyone who is bitten shall look at it and live.” 9 So Moses made a serpent of bronze, and put it upon a pole; and whenever a serpent bit someone, that person would look at the serpent of bronze and live.
Was the time of Moses a part of the current age according to Paul's reckoning? Under some Roman schemes, the current age began after the Trojan War. However, even if Paul were using such a scheme, the time of Moses wouldn't fall in the current age, as the time of Moses was set prior to the Trojan War.
According to the Etruscans, there was a cycle of ages, somewhere between 8 and 10, and at the end of the cycle the whole world would be destroyed. This seems to be what Paul is referring to in 1 Cor 10. I'm not sure exactly how the Etruscan scheme of ages worked though or if the Jewish calendar of ages aligned with it in any way.