In the process of designing the interface, we often have to think is designed according to a common standard and default is everyone knows to use it. However, there were cases involving old people as they did not use the mobile device until someone donate or use with other people also means they can never use the interface elements that designers have done. For example, I once had a chance to sit with a man at the age of 66 in the waiting room of an airline, he is using a mobile device and have the use of a library interface, then turned over to ask me that
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