End of the World or the Age?

What age or time-period was about to come to an end when Jesus’ disciples asked about "the end of the age" in Matthew 24:3? The end of the old covenant age was on the horizon with the ministry of Jesus. He was the ultimate temple (John 2:19), sacrifice (1:29), and mediator between God and men (1 Tim. 2:5). The physical temple was no longer needed. It was designed to be a placeholder for the True Temple.