In the Olivet discourse of Matthew 24, Christ refers to the ‘parable of the fig tree’. We know from other references in scripture that that the fig tree is emblematic of Israel....
Matthew 24:32 Now learn a parable of the fig tree; When his branch is yet tender, and putteth forth leaves, ye know that summer is nigh:
33 So likewise ye, when ye shall see all these things, know that it is near, even at the doors.
34 Verily I say unto you, This generation shall not pass, till all these things be fulfilled.
In 1948, Israel became a nation... it put forth its leaves. Now add a generation to that date... what do you get? What year will the oldest person born in 1948 die? That would appear to be the end date for the period of time when that prophesy could be fulfilled and be true....
I've wondered if 1967 is a better date, since that is when Israel regained Jerusalem.