The significant differences in life expectancy between countries can be attributed to a variety of factors. One of the primary factors is the quality and accessibility of healthcare systems. Countries with well-developed healthcare infrastructure, universal healthcare coverage, and advanced medical technologies tend to have higher life expectancies. Socioeconomic conditions also play a crucial role, as wealthier nations can afford better healthcare, nutrition, and living conditions, all of which contribute to longer life spans. Lifestyle choices such as diet, exercise, smoking rates, and access to clean water and sanitation also impact life expectancy. Additionally, social factors like education, income inequality, and social support systems can influence health outcomes and life expectancy.