Originally Posted by firemangeorge

Looking at the picture, the door gap to the fender gets wider as it goes higher. Take a look at the door hinges. The bushings and/or pin on hinge is probably bad.
Open the door. Lift up on the bottom of the back of the door. If there is any vertical movement or “looseness” then the hinge is bad.

If the hinges are good I would then look to see if the car has been hit in the front and pushed the fender back.

Originally Posted by donbrew

You can adjust the fender. Loosen all the bolts then use a large screwdriver or other tool in the openings at the top to move it, then with your other 2 hands tighten the bolts.