Lifelogging is the practice of automatically capturing data from life experiences through wearable devices. Lifelog collections have been shown to support memory and may be a valuable source for people as they grow old and memory functions decline. We believe that people would be more likely to adopt lifelog practices that support their current motivations for collecting items. To identify these motivations we interviewed ten older and ten younger participants. We found that motivations for and against life-long collections evolve as people age and enter different life stages, and that family is at the core of life-long collections. These findings will be used to inform the design of an intergenerational lifelog browser.