Why it happens: With lower lipid production, there are fewer fatty acids on the surface to reflect light and protect strands, resulting in lackluster locks that are prone to damage.
When it happens: The production of sebum, a natural hair oil, drops by nearly 50 percent between the ages of 45 and 65.
What you can do: Try to eliminate heat tools from your daily routine.
Product to try: Lee Stafford ArganOil from Morocco Nourishing Miracle oil ($15 at Ulta). Rub a couple drops between your hands and apply to wet or dry hair for added gleam and hydration without weight or greasy residue.