Emerging adulthood (18–25 years) is a critical developmental stage during which lifelong health-related behaviors are established, making preventive wellness essential for promoting long-term physical, psychological, and social well-being. This study examined preventive wellness behaviors among emerging adults by assessing balanced nutrition, regular physical activity, adequate sleep, stress management, preventive healthcare utilization, and personal hygiene, while also investigating their relationship with quality of life. A quantitative cross-sectional research design was employed using a structured questionnaire administered to 250 participants enrolled in higher educational institutions. Data were analyzed using descriptive statistics, Pearson correlation, and multiple regression analysis. The findings revealed that participants demonstrated generally positive preventive wellness behaviors, although lower participation was observed in preventive healthcare utilization and stress management. Physical activity, balanced nutrition, and sleep quality emerged as the strongest predictors of overall wellness and life satisfaction. Significant positive associations were identified between preventive wellness behaviors and physical health, psychological well-being, academic productivity, and social functioning. The study concludes that preventive wellness should be promoted as an integrated lifestyle approach rather than isolated health practices. Strengthening wellness literacy, encouraging routine preventive healthcare, and implementing evidence-based health promotion programs within educational institutions can enhance sustainable healthy behaviors among emerging adults and improve their long-term quality of life.