With the growing number of elderly people in our society and the search of this population for technologies, more specifically the use of smartphones, and considering the physical and mental difficulties that aging causes to these people, there is a need to apply concepts of usability in mobile apps. However, there are technical and cultural barriers for the application of usability to be effective in meeting the needs of the elderly. Developing systems with agility as the market demands is antagonistic to the time required for application and usability evaluation in the software. Besides, the lack of usability requirements due to knowledge absence and time are some difficulties that the development team encounters in their daily lives. Given this context, the objective of this work was to create a prototype to help the development team to integrate usability, with a focus on elderly audiences, during the construction of a mobile application. To achieve this goal, the list of requirements, metrics and usability assessment methods focusing on mobile and elderly applications were selected from related works. Then the relationship between requirements, metrics, and assessment methods was identified and tested and the prototype was developed. Finally, with the analysis of the test it was possible to verify that the prototype reaches its objectives, as 88.9% of the participants would use the prototype in their projects and all stated that the prototype can contribute to the development of mobile applications.