If you are going to use Bible definitions, a generation begins when a person is 20 yo which means that a person 20yo in 1914 turns 120 in 2014. “Just like in the days (120y) of Noah…” So, time was up in 2014 and no gt.
However, lets give it another 20 years and use 1934 as the starting point for 120 to arrive at 2034 to keep all hopes alive that the 1914 generation ( 120 years max ) like in the days of Noah will experience the gt.