The Centers for Disease Control and Prevention reports that the life expectancy at birth in the U.S., based on 2022 mortality data, is 77.5 years. This figure, known as period life expectancy, is calculated by averaging the ages at death for all individuals who died in 2022. While useful for comparing yearly mortality conditions, it may not accurately predict future life spans due to ongoing improvements in health and medicine. A more precise measure, cohort life expectancy, involves tracking the age at death for everyone born in a specific year. For instance, analyzing the mortality of those born in 1920 provides a detailed view of their life spans. However, obtaining complete data for a cohort requires waiting until all members have passed away, a process that can take over a century. To address this, the Social Security Administration uses historical and current data to project future life expectancies.
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