The generation of the fig tree at the Olivet discourse were those who lived in 30 AD — it was fulfilled largely (but not completely) at 70 AD with the destruction of Jerusalem as Jesus prophesied, as Daniel saw in his vision
"Truly I tell you, this generation will certainly not pass away until all these things have happened. Heaven and earth will pass away, but my words will never pass away.” Jesus didn't say things would be "largely fulfilled/incompletely fulfilled", He said ALL. There are many things yet to happen which is why the preterist cop-out of the 70 A.D. temple destruction being IT fails. Even a cursory read of Jeremiah 31 more than proves God is not done with Israel and there are signs happening right now that indicate Christ's return may be imminent.