The document summarizes a study that evaluated the use of multi-layered interfaces versus single interfaces for mobile applications among older and younger adults. For older adults, the study found they preferred multi-layered interfaces for learning as it provided a gradual learning curve but had equal preferences for long-term use. Younger adults had mixed preferences for learning and preferred multi-layered interfaces for efficiency long-term. The findings provide insights into designing interfaces that consider the needs of different age groups.