The user is a determining part in the success of an application and even though not the majority, the elderly users make up a considerable part of the whole. With the exponential evolution of technology, it is important to understand if this elderly audience has the ability to adopt new technologies and if they can use the systems embedded in these new devices, such as smartphones. The hypothesis recorded in this research is that even being mobile users, the elderly has difficulty understanding interface objects, interfering the interaction with mobile applications. The objective of this research is to analyze the quality of the usability of mobile applications by elderly people and the understanding of interface objects (graphical elements that have different functionalities and that make up the interface of the mobile applications). The volunteers participated in a demographic questionnaire to specify the participants profile, a comprehensibility test and a usability test to assess the audience s ability to interpret and interact with these new systems. And, in the end, they answered a debriefing questionnaire to record information about the experience of these users group with the tests applied. Finally, the result achieved with the research conducted partially denied the proposed hypothesis and strengthened the understanding that the elderly user, for the most part, has the cognitive and semantic ability to understand and interact with applications developed for Apple s iOS operating system.