Difficulty in walking at this age can be due to many reasons - 1) Brain atropy or stroke or other Brain condition. 2) Degenerative spine causing severe spinal cord compression. 3) Generalised weakness or myopathy 4) Muscle stiffness conditions or 5) joint stiffness and joint problems 6) Severe body pain The treatment depends on the condition, need to see the patient and examine to tell what is required. Consult a Neuro doctor for evaluation and treatment Till then continue the same treatment