Layers: Retouching Out the Signs of Aging
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1. START with an image of a face, or portrait, in RGB or Greyscale mode.
        Open the layers pallette.

2. Duplicate the background layer by dragging the layer to the new layer icon
    at the bottom of the layer's pallette. This creates Background copy 2.

3. Making sure the caps lock key is off, type the letter D
    on the keyboard to ensure the toolbox has black as the
    foreground and white as background color.

4. Click on the Quick Mask Mode (Q) .

5. Click the paint brush tool in the toolbox.

6. Paint with the brush any lines and wrinkles or signs of Aging on the face.

7. Click the Normal mode ( on keyboard type Q again to switch back).

8. Select > Inverse on the top menu outlines the signs of again with marching ants. 

9. Filter > Blur > Gaussian Blur with a 2 pixel radius.

10. FINISH. To make the blur look more natural, decrease it by lowering
        the opacity of the layer to 40% to 70% opacity.