Life Expectancy: Meaning, Statistics, and Age Insights

Few numbers carry as much weight as life expectancy. It’s the statistic that quietly shapes retirement plans, insurance policies, and personal health decisions — but what does it actually mean once you get past the headline?

Global life expectancy at birth (2023): 73.3 years (WHO) ·
U.S. life expectancy at birth (2023): 79.0 years (CDC) ·
Female vs male life expectancy gap (U.S.): 4.9 years (CDC) ·
Life expectancy at age 65 (U.S., 2023): 18.5 additional years (CDC) ·
Life expectancy at age 80 (U.S., 2023): 9.1 additional years (SSA)

Five facts that frame the discussion:

The pattern: these figures are a baseline — your own health decisions rewrite the odds.

What is the meaning of life expectancy?

• Life expectancy is a statistical measure of the average number of remaining years a person of a given age can expect to live, based on current mortality rates (Wikipedia).
• It is calculated from mortality data at specific ages, using life tables that track death probabilities (CDC FastStats).
• Life expectancy is distinct from maximum possible lifespan, which is the theoretical upper age boundary for a species (Wikipedia).

How is life expectancy calculated?

• Actuaries and epidemiologists construct life tables from death registrations and census data, then compute the average survival time for each age group (WHO Mortality Estimates).
• The calculation assumes current death rates remain constant — it’s a snapshot, not a prediction of future trends (CDC Mortality Brief).

What is the difference between life expectancy and lifespan?

• Life expectancy is an average for a population; lifespan refers to the maximum duration an individual can theoretically reach — about 120 years for humans (Wikipedia).
• Most people never reach the maximum lifespan; global life expectancy at birth in 2021 was 71.3 years (WHO).

How long can a 70 year old woman expect to live?

• In the United States, a 70-year-old woman has a life expectancy of about 16–17 more years, based on CDC life tables (CDC FastStats).
• For men at 70, the figure is lower — roughly 14 more years, reflecting the persistent 4.9-year gender gap (CDC FastStats).
• At age 65, U.S. men and women together average 18.5 additional years (CDC).

How Long Can Retirees Expect To Live Once They Hit 65?

• For a 65-year-old, the average remaining years in the U.S. is 18.5 (CDC).
• Women at 65 can expect about 20 more years, men about 17 (CDC FastStats).

What percentage of 80 year olds live to 90?

• At age 80, U.S. life expectancy is 9.1 additional years (SSA).
• Roughly 30–40% of 80-year-olds reach age 90, depending on gender and health status (NIH Study).

What is the most common cause of death in 80 year olds?

• Heart disease is the leading cause of death for both 70- and 80-year-olds in the United States (CDC Leading Causes).
• Cancer, stroke, and chronic lower respiratory diseases follow closely (CDC).
• Globally, ischaemic heart disease was the #1 cause in 2021, responsible for 9.0 million deaths (WHO).

What is the leading cause of death in 70 year olds?

• Same pattern — heart disease ranks first, accounting for roughly 1 in 4 deaths in that age group (CDC).
• Unintentional injuries (accidents) become a larger factor in the 70-79 age bracket compared to older ages (CDC).

The implication: cardiovascular disease is the dominant risk — and it’s modifiable, making the next decade the most actionable window for longevity efforts.

What birthday lives the longest?

• Among people who survive to advanced age, the most common age reached (the “birthday” most celebrated) is typically 85–90 in developed countries (WHO Mortality Estimates).
• The median age at death in countries like the U.S. is around 80–85 (CDC).

At what age do most people pass away?

• In the U.S., the average age at death (for those who die after age 1) is about 78 for men and 82 for women (CDC).

Is 70 years a long life?

• In countries with life expectancies above 70 — which includes most developed nations — dying at 70 is below the average (WHO).
• For men globally, 70 is close to the average; for women, it’s about 7 years short (WHO).

What is the biggest indicator of long life?

• Muscle strength and muscle mass are among the strongest predictors of longevity, particularly in older adults (NIH Study on Longevity Indicators).
• Cardiorespiratory fitness, a healthy diet, and never smoking are also consistently associated with longer life (CDC).
• The U.S. premature death rate under age 70 is 408 per 100,000 — nearly double the peer country average of 228 — highlighting the outsized role of early mortality (Health System Tracker).

At what age do most people start feeling older?

• Self-reported “feeling older” often begins in the 60s or 70s, coinciding with declines in muscle strength and functional capacity (NIH).

The three biggest indicators of longevity

• Muscle strength and mass — grip strength alone predicts mortality risk (NIH).
• Cardiorespiratory fitness — VO2 max is a powerful marker (CDC).
• Non-smoking and healthy diet — together they can add 10+ years (WHO).

The catch: for Americans, the huge premature death gap compared to peers means small changes in middle age can dramatically shift the odds.

For the 70-year-old woman reading this in the U.S., the numbers say she’s likely to live another 16–17 years — but that average hides the fact that nearly one in three men in her age cohort won’t make it to 80. The gender gap isn’t just a curiosity; it’s the single largest demographic force shaping retirement planning and healthcare demand.

For a deeper look at the factors that influence longevity, see our analysis of the best predictors of long life.

Frequently asked questions

Related reading

• John Daly’s Health Battle, Net Worth, and Career Updates
• Bray Wyatt Cause of Death: Heart Attack After COVID-19