Market Maior is a UI/UX design prototype of a grocery delivery app that highlights UI/UX accessibility to the 55+ population. This topic is important and timely because we’re living through a transformation in which mobile apps represent our ways of living, and they’re still developing at a rapid rate. Having observed my grandparents’ insecurity navigating a digital lifestyle, my project and I hope to call for age-inclusive design thinking and application, a lens under the overarching inclusive design practice that is relatively less discussed. Market Maior will be showcased as a clickable prototype of a grocery delivery app that incorporates an option for the users of this grocery shopping app to switch to a more age-friendly interface. In addition, the app includes a built-in simulation game that syncs user data and rewards players with promotion codes to be used in later purchases to encourage cycling back from users to players, then players to users. In order to make the experience more entertaining, gamification is one of the most vital parts of Market Maior that involves research and experimentation. The project is designed with an iterative workflow bringing in user testing and iteration based on test findings, and the iterative process plays an active role in the project that is documented in a case study.