The tail end of brows are one of the first things to go as you age, says Chang-Babaian. Here's how to keep yours looking full and youthful:

- Hold a pencil on the side of your nose and inner corner of the eye. If your brow does not touch the pencil, fill in lightly with a brow pencil or pomade in a slightly darker color than your natural brows. Use short, hair-like strokes.

- The arch should start above the outside of the pupil. Aging brows often begin falling here. Fill in above the arch to create the illusion of a lifted brow.

- Hold a pencil at an angle from the inside of the nose to the outside corners of the eyes. The tails of the eyebrows should end here, but aging makes them thin and shorter. Extend the ends with light, gentle strokes with an eyebrow pencil.