This chapter delves into the critical interplay between lifestyle and healthy aging through the lens of life course perspective. Drawing on theoretical frameworks such as Pierre Bourdieu’s habitus, Max Weber’s concept of life chances, and socioeconomic determinants, it underscores how physical and social activities shape mental, physical, and emotional well-being across various life stages. Evidence from longitudinal studies highlights the transformative impact of regular physical activity in reducing anxiety, enhancing cognitive functions, and preventing chronic diseases, thereby significantly improving quality of life in later years. Similarly, social engagement emerges as a vital factor in mitigating isolation, strengthening interpersonal bonds, and fostering a sense of belonging-key components of successful aging. The chapter also explores the broader societal implications of demographic aging, emphasizing the importance of public policies that promote active aging and challenge ageism. By advocating for health promotion strategies tailored to individual life trajectories, the chapter highlights the need to account for socioeconomic disparities and cultural contexts to ensure inclusivity and equity in aging policies.