Gait disturbances in older age.  The reasons are many and varied, but researchers agree that identifying the source and preserving mobility are primary concerns.
D000058:Accidental Falls / Q000517:prevention & control*; D000368:Aged; D020233:Gait Disorders, Neurologic / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy*; D006801:Humans; D051346:Mobility Limitation; D004856:Postural Balance