You speak as though you know for a fact that the universe has been around forever. Try to imagine a universe that has been around for an infinite amount of time. Infinite means "no end". It goes forever. So if the universe is infinitely old, then an infinite amount of time has passed before the present, which means it would take forever to get to this point in time. Obviously we are here in time, so there must be a point in "time" in which time was created(sounds wierd :)).

Time, as we know of it, cannot be infinite, because in order for "time" to exist, we need something to compare it to. If it has existed for infinity, then it cannot be compared to anything.

Using the argument, "the universe has been here forever" would be like saying "ok in an infinite amount of time from know I am going to grow some flowers."