In your 40s put an emphasis on the overall health of your hair, so take time to deep-condition and schedule regular trims. "At this age, your strands become drier and less shiny, so you need to cut it frequently to keep it healthy," said hairstylist Marcus Francis, who has worked with Salma Hayek. Also, don't be afraid to try layers, highlights, or a shorter crop to avoid falling into a hair rut. "There are so many great styles suitable for women in their 40s. A vibrant color or highlights around the front can brighten up your face and give you a fresh look," said Josè Eber, whose salon clients include Selma Blair.