“…First, studies suggest that older adults feel stress when the structure of the menu becomes deeper. Hence, menus should be simplified and flattened, and the nesting of features and available options should be avoided, as older adults require a longer time to think of what to select (Gao, Ebert, Chen, & Ding, 2015;Kim et al, 2007;Lee, 2007;Mi, Cavuoto, Benson, Smith-Jackson, & Nussbaum, 2014). As older adults' mental models are not always hierarchical, a one-level menu navigation may be easier to manage.…”