How is life expectancy often highest in a country?

Life expectancy is often highest in countries that have advanced healthcare systems due to several interconnected factors. Advanced healthcare systems typically provide a comprehensive range of medical services that are widely accessible to the population. This includes preventive care, vaccinations, maternal and child health services, and effective treatments for diseases, which collectively contribute to lower mortality rates.

Additionally, an advanced healthcare system often reflects a country's investment in health infrastructure, research, and training for healthcare professionals. These systems usually ensure that citizens have better access to medical facilities and medications, leading to earlier diagnosis and treatment of health issues. Complications from diseases that otherwise could lead to early death can be managed more effectively, resulting in longer, healthier lives.

Countries with high birth rates often face challenges related to maternal and child health, which can adversely affect life expectancy. High population density can lead to resource strain, and limited access to education tends to correlate with poorer health outcomes because education is linked to increased health awareness and better health-seeking behaviors. Therefore, the presence of an advanced healthcare system is a primary factor contributing to higher life expectancy.