Our perception of time is very subjective: it is affected by our age, by what we are doing, and it is known that it can be significantly altered by consuming certain substances. We learned from others that there was time before we were born, but do we feel that? In my own subjective perception of time the moment of my birth seems to be infinitely far in the past, and I can't be sure that the final moment of death will be a finite point approachable by consciousness.
