When I taught the geriatrics module I used to pull out the "fogey suit" - goggles wrapped in saran wrap (to simulate retinal degeneration), big winter gloves and boots (to simulate neuropathy) ankle and wrist weights (and sometimes a vest to shift their center of balance), and hearing protectors (to simulate partial hearing loss). I'd put one of the younger students in it and have them try to do things like get up and answer the door, sweep the floor, etc.
Then I'd have another student try to perform an assessment. Since I cut their hearing and visual acuity down with the ear muffs and goggles it meant they had to take their time and really concentrate on communication with the "patient".
Yesyesyes - I know not every geriatric patient will have deficit, but making someone experience it (from either end) is a good learning tool. You could even take the goggles or ear muffs off so the interviewer has to rely on the intact sense (e.g., getting right in front of the patient so they can read their lips as they try to interview)