The global increase in the elderly population has a direct influence on the travel, tourism, and hospitality sector because senior travelers have become major consumers. Therefore, developing a deeper understanding of senior motivations for overseas travel is required. However, the presence of theoretical and practical gaps limits the comprehension of this demographic market. Thus, this research sought to identify the underlying dimensionality and measurement of senior travel motivations and developed a scale to measure them. In addition, it validated the scale across future travel behaviors and preferences for tourism types and sites. An eight-factor structure of senior travel motivations was generated. The overall construct satisfied a series of convergent, discriminant, and nomological validity tests. Furthermore, the scale demonstrated a predictive explanatory power for profiling the future travel behavior and preference of seniors.