I think its the generation that begins to see the signs that relate to the end, about which Jesus was talking in Mt 24 and Lu 21.
Theories and speculation to excite the senses. That's all we seem to have working here.
You can't say for sure if it was 1948, or 1968, or 1973, or 1988, or 1998, or ... because everytime a date comes and goes you need to revise the theory.
I'm just glad Jesus and the apostles were not so speculative as modern day prophecy preachers selling their books and videos.