My eyes are aging asymmetrical. What can be done to fix this? (Photo)

The tendon that pulls your left upper lid upward has slightly disinserted and is causing you to reflexively lift your left brow. The upper lid fat is getting pulled up deeper into your eye socket, creating an  apparent hollow. The treatment is to reinsert the tendon so that the two eyes are opening symmetrically. The fat needs to be pulled back into the sunken area. The right eye may or may not have the same problem to a lesser degree.  One thing to note is that once your ptosis is corrected, your brows will drop to some degree. Some doctors would advocate a simultaneous browlift or in your case, a brow suspension to stabilize the brow and prevent a descent of the brow. A comprehensive exam and a discussion about your goals of surgery would point you into the direction that you want to go.

My review of your photos shows that you are missing more of the periorbital fat above the left eyelid, leaving it looking more hollow than the right side.
I often replace this loss of volume with fat or filler which is done through a small needle.  No incisions.  Minimal to no recovery.  Problem solved.
A blepharoplasty can remove the skin excess, but will still leave you more hollow on the left side.

You have bilateral upper eyelid levator aponeurosis disinsertion ptosis.  The disinsertion is a bit more dramatic on the left side.  These white line disinsertions allow the levator aponeurosis to retract back in to the orbit.  A normal outward upper eyelid fold is an antiform fold eyelid.  When the tendon disinserts, the fold collapses and inverts.  I call this a synform fold eyelid.  These are terms that are analogous to how geologists describe land folds.  The fat is all there it is just pulled into the anterior orbit.  The solution is not to fill up the sulcus with fillers because this does nothing to fix the underlying problem which is the upper eyelid ptosis. You do not need a brow lift and in fact you are performing your own brow lift due to the compensatory brow elevation caused by the upper eyelid ptosis.  A fat and muscle sparing blepharoplasty is the wrong solution.  You need structural help in the form of anterior levator aponeurosis advancement ptosis surgery, an anchor blepharoplasty with preservation of the skin, and preservation and redeployment of upper eyelid fat to help reform the natural antiform upper eyelid fold.  The surgery will also support your droopy upper eyelid lashes.