Eyelid weakness in the elderly may be a normal physiological phenomenon, or it may be caused by myasthenia gravis, motor nerve palsy and other reasons. 1. Normal physiological phenomenon: along with the age of the elderly, the local muscles of the eyelids will become more and more relaxed, and there will be a feeling of weakness of the eyelids, which may also be accompanied by the drooping of the upper eyelids, which belongs to the normal physiological phenomenon and does not require special intervention. 2. Myasthenia gravis: If the old man suffers from myasthenia gravis, it will lead to dysfunction of neuromuscular junction, which will cause fluctuating weakness of eye muscles, medulla oblongata muscles and limb muscles, resulting in weakness of eyelids, which may be accompanied by strabismus, diplopia, shortness of breath and other symptoms. 3. Movable eye nerve paralysis: Usually due to various factors, the movable eye nerve is involved, thus causing eyelid weakness, which may also be accompanied by eyeball downward strabismus, diplopia and other symptoms. Eyelid weakness in the elderly may also be caused by other reasons. If accompanied by obvious discomfort symptoms, you should seek medical advice as soon as possible, make a clear diagnosis, and then be guided by a doctor for treatment.