Much of the time is gone, nothing is there in front of you. A direct portion of the life is gone. It is said we are not there for first time. We are permanently there and can't escape this universe. We are the Universe actually, so one who is trying to get the escape of this universe is unknown of the fact that escape of the universe is the escape of the self. What I can assume about Nirvana is that it is not actually the end of the cycle but the end of the Darkness, the darkness of the unknowingness. See everything is so rooted with the Memory that Memory is a permanent attribute of it. You daily rub the thread to a stone, it is going to create a way and after few days, there will be no need of consciously rubbing the thread on same row, because the way itself is going to take the thread from the way created. Same is the case with water, water makes the way and next time water goes from the same way it has created first. This can be correlated with the Samskaras of Human beings. When we say the person is born with these qualities of his father and mother, it doesn't mean that these qualities cannot be changes but all we have to do is change the way created by being conscious again. If we can live the whole life consciously it is going to be a great life. Because then we will be able to recognize the created ways and also will be able to modify them and hence we will be known of the functioning of Memory. Yes it hurts when we try to change the Paths and hence it is difficult to change the habits but not impossible.
Nirvana should not be the end of cycle of birth and death. But the end of less perception, because one memory is definitely going to end when we create another one. It all is about Vision. Hence Buddha was not who had large ground of understanding and knowledge but he was a Drushta, One has a wide vision and by looking inside one, who can behave accordingly. It will be his wisdom and desire to reborn and one who has gone away from the influences of others influences. One who feel the sorrow and pleasure but away from it. One Who has that Eye.
This all is for today, till next be happy keep learning.
Love You all.

