A generation is a group of people in a 20 to 30 year time period. They age generally together and die generally in a similar period of time.
When Jesus spoke of it, it applied to those who would see the destruction of Jerusalem.
The governing body applying it to themselves is delusional, desperate nonsense.
Lurkers: There are other places to go. You don't have to entertain these false prophets anymore. You WILL be happier elsewhere, despite what they say. Of course they are going to say that there is nowhere else to go. They want control of your life. They have taken advantage of you long enough. Listen to your brain.