The beauty of the long bob is how versatile it is. Want to wear it up? No problem. Down and straight? That's pretty, too. Messy? That's a nice, updated touch.
Calista Flockhart's long bob hairstyle has a slightly messy look to it that's very "in" right now; but the overall effect is still very grown-up and sophisticated.
More bob hairstyles for over 40: