My hair is only 3/8ths-inch long now (full head of hair, short by choice!) and I usually have the sunroof open. Still, the fixed portion of the roof is about in the middle of my head when the roof is open and my hair brushes the headliner.
Eric H. - In my Volvo wagon, there is something at the front of the driver's seat and at the rear as well that allows you to mess with the height / tilt attitude... I'll check that now to see if my W124 is similarly equipped.
1989 300 E
1992 190-E 2.3