When making the floor looking older than it is, we have to insert on a new layer a kind of texture, like that one shown below:



Group out this layer with that one the floor is situated on: Layer - Create Clipping Mask (ctrl+g). Distort the texture's perspective to make it look exactly like that one of the floor. Use the next selection: Edit - Transform - Perspective:



Change the layer's type on Multiply:



The texture we have looks too dimly, that is why we'll change a little its color with Image - Adjustments - Selective Color.



Now we have to change also the brightness and the contrast, applying Image - Adjustments - Levels (ctrl+l).