Wannabefree has the exact cult intention on this:
The current understanding though, as I understood it from the convention, is that "this generation" refers to those anointed ones who will see the great tribulation lives overlap with those who were able to discern the sign in 1914, like Fred Franz, who died in 1992, so anybody annointed before Fred Franz died would be a part of the generation that will not pass away.
A wee bit further, they want the members to think that contemporaries of the likes of Fred Franz would mean people who were adults working with him before his death. That would make the overlap anointed kind of old also. That is the urgency factor.
Later, they will stretch the overlap generation to be those that were born before the 1914 anointed passed away, and sometime before or after that they will go back to the 1914 anointed just being born by 1914. This will all be after the urgency factor is just soooooooo worn out.