The Universe does not end at the boundary up to which we can see today. If the Universe is x years old, then we cannot know anything about the parts of the Universe that are more than x lightyears away from us, because signals from those parts have not yet had enough time to get to us. It is very well possible (and very likely) that there is far more space beyond the boundary up to which we can see today. That boundary is not a hard edge, and moves away from us at a speed of one lightyear per year (i.e., at the speed of light).
Even a finite Universe need not have a boundary. That means that there does not have to be an edge even if the Universe contains only a limited (but very large) number of liters of space. In the same way, an ant that walks across a balloon finds no edge, though the balloon has only a limited size. So, even in a finite Universe there need not be an edge that is closer in one direction than in another direction.
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