Her jowling and excess skin in the front of the neck was advanced enough to warrant a face lift operation.  She also had a brow lifting procedure.  Gravity pulls on everything.  Everything.  And the brows don't escape.  It's natural for them to drop in position over time, although of course the amount they drop and at what age they drop mostly depends on heredity.

The brow lift can be an excellent adjunct to the face lift operation.