What term refers to the average number of years a person is expected to live?

Life expectancy is the term that indicates the average number of years a person is expected to live, based on various factors such as socioeconomic conditions, healthcare access, and overall living standards. This measure provides insight into the health and longevity of a population and is often used to assess the effectiveness of a country's healthcare system and quality of life.

The other terms do not pertain to the average lifespan. Infant mortality refers to the death rate of infants, typically measured as the number of deaths of infants under one year old per 1,000 live births. Shantytowns are informal settlements characterized by substandard housing, often lacking proper infrastructure, but do not relate to the overall life expectancy of individuals. Relief generally refers to aid or assistance provided in response to a crisis or disaster, which is also unrelated to the concept of average lifespan.