Why are life expectancy in different countries differ?

Life expectancy varies between countries due to a combination of factors, including healthcare access, economic conditions, nutrition, and lifestyle choices. Countries with advanced healthcare systems tend to have better medical services, preventative care, and health education, leading to longer life spans. Additionally, social determinants such as education, income levels, and living conditions significantly influence health outcomes. Environmental factors and public health policies also play crucial roles in shaping the overall health of populations.