Sometimes you just need a quick fix. Makeup can offer that.
Start with a smooth, prepped base. A mattifying Base Primer helps dramatically reduce the appearance of pores instantly, so your foundation will go on smoother and won't sit in neck creases. Apply your normal shade of foundation all over the face and neck, then, with either a cream or powder product that is several shades darker, fill in your jawline. It will look crazy to begin with, but using a brush, damp sponge or your fingertips, gently blend the darker colour out. This creates shadow and definition, meaning that at a glance, your neck is significantly slimmer and younger looking. Too easy!