{This generation} (h(8820)genea haut(885c)). The problem is
whether Jesus is here referring to the destruction of Jerusalem
or to the second coming and end of the world. If to the
destruction of Jerusalem, there was a literal fulfilment. In the
Old Testament a generation was reckoned as forty years. This is
the natural way to take verse  34  as of  33  (Bruce), "all
things" meaning the same in both verses.