During the first year of my Ph.D., I have focused on the accessibility design of touchscreen applications. This interest was motivated by the fact that the older population is increasing globally and older adults are interested in using technology. My grandma (on the photo) is a beautiful example of that. In response to these changes, there is a growing body of literature on how to make touchscreen devices and applications more accessible to them. In our systematic literature review, we look into the last decade of research-based design guidance, analyze it, extract individual guidelines, and categorize them based on two taxonomies: capability model and touchscreen design categories.