Realistically, printed matter that extends to the paper's edge needs to go further than that! This is what is known as 'bleed'.
The page is normally printed on a larger sheet, with crop marks, and the colour objects extend over the cropped area, so that the trim line is within the inked area.
If the edge of an inked area is on the trim line, this invariably leaves a little white line where the blade and the ink don't quite meet. Cutting through the inked area guarantees no white lines.
To create a page with crop marks and bleed, of course, you need to go back to the original artwork in a competent application.