There are many that try to predict end of this age. I would like to talk about people that actually have done some work to answer this. Yes even in this there are researches, understandings and knowings. According to Issac Newton, who is a devout Jesus believer, he read the book of Jubilee to try find this time. A guy like him is very intense and passionate in his writing and calculation. He did not marry and he may even be virgin. I personally think he is. You might find it strange, I use the present tense, as though he is alive. Well, in the Christian and some Jewish religion, they consider those who are up there are alive and those below are dead.
Coming back to the point of his calculation. Newton though the end of the age is 2060. How he came to this thought is he would count the years of jubilee. They are time intervals. I suppose there must be somewhere that may say this many jubilee passes and it ends.
Then there is the book of Acropolis of Ezra. This is really interesting. Ezra the prophet is having a conversation with God. In those days, I think prophets were more able to talk directly the Lord. In the discussion, he ask when will it happen. The Lord said to him, the time that has past is less than the time left. If the conversation was indeed about the end time, then some have evaluated the time for ending is 2045. That is if they can definitely calculate exact year Ezra may have lived and had this talk.
So it is a intriguing idea. These books are and thought was not necessary hidden, but I do believe it was meant to be unsought by the majority of the people. I think there are few to see some of all this and see how it may fit.
There are other factors, if discovered all this may look more possible. There are more to the world than it is. However when a powerful generation comes, they see no past, present or future without them.