1.It is the applied science of equipment design, as for the workplace, intended to maximize productivity by reducing operator fatigue and discomfort.
2.Comfort, safety, easy to use, gives good response and performance.
3-comfort:for example an elderly-friendly chair has to have a comfortable backing made of memory foam/cushion for comfort of their back
3-safety:an elderly friendly toilet has handle bars for safety.
3-easy to use:an elderly friendly phone does not have much complicated functions but is user friendly
3-gives good response:the product has to allow the elderly to use it without much strength put it
3-performance:it can be used for a long period of time without getting damaged