How long is an age? Could be 100 years? Could be a generation? Are we the generation that will not pass away until we see His return?
The definition of a Biblical 'age' (NT Greek
aion) depends on other describers with it in context. In Matthew 24:3 the subject is about the end of this present world when Jesus returns. So it's referring to this present world time, from Genesis 1 to the end. In the majority of NT cases, Greek
aion refers to this present world. The Englishman's Concordance is a great word study tool that will show you every Bible example of a word in the Bible manuscripts, so you can compare how the translators defined it into English. It uses Strong's numbers, which are based on Dr. James Strong's numbering of the words in the 1611 KJV Bible.
Are we the last generation? I personally believe so. Israel becoming a nation again in 1948 wasn't by chance, for God had promised He would bring Judah back to the land (along with others) and not take them out again. If there is not another foreign nation that attacks today's state of Israel and removes them all captive again, then that Jeremiah 24 prophecy will have been fulfilled in 1948. Jeremiah 24 is part of the parable of a fig tree that our Lord Jesus commanded us to learn in Matthew 24 and Mark 13.
One of the seven signs of the end Jesus gave in His Olivet discourse was that of wars and rumors of wars. But at the end of that He then said not to be troubled for those things must be, but the end is not yet. In other words, as long as there are wars and rumors of wars, then the end is not yet. In 1 Thessalonians 5, Apostle Paul showed that when the deceived say, "Peace and safety", then "sudden destruction" will come upon them. So the end is pointing to the great tribulation time. It will be a time of world peace, howbeit a fake peace. How close are we to that today, one should ask themselves? Pretty close in my opinion. The nations serving under the U.N. flag are in many countries today trying to put an end to Islamic terrorism, peace loving Muslims, and even our cold war enemy (Russia) helping in that. And the orthodox Jews in Jerusalem today already have the materials ready to build another temple in Jerusalem, which is a requirement for the "abomination of desolation" prophecy to take place.