Do you appear tired even though you aren't? Is the skin of your upper eyelid overhanging the normal lid crease and nearing the eyelashes? Are there bulges and bags where there shouldn't be? Do your eyes appear smaller than they did in years past?
If you're much over forty, chances are that some or all of the above may be present. During the late thirties and early forties, the elasticity in the thin and delicate eyelid tissues starts to give out, even if the rest of the face still looks perfect.
Why else might you consider eyelid surgery?
You may be able to feel an extra heaviness in the upper lid or feel its skin sitting on your lashes. To increase your peripheral vision, you need to lift up your forehead. Your boss may call you in and start dropping hints about retirement. Perhaps your father looked awfully baggy by age sixty and you really don't relish the idea of watching the same thing happen to you.
So, how do you tell if you really need cosmetic eye surgery? In fact, most people never need to have a blepharoplasty. Baggy eyelids are simply not the same as a disease.
The reason you undergo cosmetic eyelid surgery is because you WANT it.