When the Lord Jesus returns, this age comes to an end.
Matthew 25:31-34 (HCSB) “When the Son of Man comes in His glory, and all the angels with Him, then He will sit on the throne of His glory. All the nations will be gathered before Him, and He will separate them one from another, just as a shepherd separates the sheep from the goats. He will put the sheep on His right and the goats on the left. Then the King will say to those on His right, ‘Come, you who are blessed by My Father, inherit the kingdom prepared for you from the foundation of the world.
This is also revealed in John's Apocalypse:
Revelation 6:12-17 (HCSB) Then I saw Him open the sixth seal. A violent earthquake occurred; the sun turned black like sackcloth made of goat hair; the entire moon became like blood; the stars of heaven fell to the earth as a fig tree drops its unripe figs when shaken by a high wind; the sky separated like a scroll being rolled up; and every mountain and island was moved from its place. Then the kings of the earth, the nobles, the military commanders, the rich, the powerful, and every slave and free person hid in the caves and among the rocks of the mountains. And they said to the mountains and to the rocks, “Fall on us and hide us from the face of the One seated on the throne and from the wrath of the Lamb, because the great day of Their wrath has come! And who is able to stand?”
There will be no time to get ready once He comes. Today is the day of salvation! Flee to Christ in repentance and faith - there is no other refuge.