Your choice of hair styles may be killing your hair. You need to learn to vary your styles ever so slightly so that you do not fatigue areas of focus.
An area of focus is the area from which your style starts, such as a parting which could be bang in the center of the head or to the side of the head [whether left or right!] or a fringe which could be frontal or sideways.
What this means is that if you like to wear a center parting all the time for instance, you will have to learn to shift the parting slightly sometimes from left to right, but just slightly off the center.
This helps to vary your look and puts less pressure on the parting being on the same spot for many years.