They have.
And since it came into being first it must be supposed to have come into being prior to the others, and the others later; and the things which came into being later, are younger than that which preceded them? And so the other things will be younger than the one, and the one older than other things?
True.
What would you say of another question? Can the one have come into being contrary to its own nature, or is that impossible?
Impossible.
And yet, surely, the one was shown to have parts; and if parts, then a beginning, middle and end?
Yes.
And a beginning, both of the one itself and of all other things, comes into being first of all; and after the beginning, the others follow, until you reach the end?
Certainly.
And all these others we shall affirm to be parts of the whole and of the one, which, as soon as the end is reached, has become whole and one?