Well, I'm of the unpopular opinion that 'the Gentile Times' have in no way 'ended'. Kinda obvious to me, so any and all "generation" talk is moot. No need for "new math".
Plus this whole thing: Luke 21:27-Then they will see the Son of Man arriving in a cloud with power and great glory.
Whatever "generation" is supposed to actually see that happen. I don't know anyone who has.
Of course, I'm also of the unpopular opinion that Christ isn't 'invisibly reigning' either. That's kinda obvious too.