Final answer:
The life expectancy at birth for the cohort born in 2014 in the U.S. was approximately 79 years. This measure reflects the health and wellness of the population and can vary widely due to factors like healthcare, nutrition, and socioeconomic conditions.
Step-by-step explanation:
For the cohort born in 2014, life expectancy at birth was 79 years for the overall U.S. population. This is Option 2: 80.5 years, which is approximate and aligns with the information we have that the life expectancy for those born in the United States around that time was around 79 years old. This statistic serves as a measure of the overall health and well-being of a population, reflecting a wide array of factors including access to healthcare, nutrition, and societal conditions. The life expectancy in developed countries like the United States is generally higher than the global figure, which was about 67 years in 2013. Factors such as a nation's wealth, healthcare expenditures, and lifestyle changes can greatly affect a country's life expectancy rate. The United States was ranked 53 out of 228 nations, with countries like Monaco having a much higher life expectancy and others like Chad having lower.
It is important to note that life expectancy is average; a significant number of people may live shorter or longer than the average. Furthermore, disparities exist within a country's population, with differences often observed across racial and ethnic groups.