Question 1

What is the average life expectancy in the United States?

Accepted Answer

According to the WHO Global Health Observatory, period life expectancy at birth in the United States is approximately 74 years for men and 80 years for women. National figures are averages drawn from current mortality rates and vary year to year as data is updated.

Question 2

Does life expectancy differ between men and women?

Accepted Answer

Yes. In almost every country, women live longer on average than men, typically by 4 to 7 years. The gap is consistent across populations and is partly explained by biological factors and partly by differences in behaviour and occupational exposure at the population level.

Question 3

How accurate is a life expectancy calculator?

Accepted Answer

A calculator like this one gives a statistical estimate built from population averages and well-documented lifestyle adjustments. It is useful as a reference, but it cannot account for genetics, individual medical history, or future events, so the figure should be read as a range rather than a precise prediction.

Question 4

What factors increase life expectancy the most?

Accepted Answer

At the population level, the factors with the largest measurable effect are not smoking, regular physical activity, a high-quality diet, healthy body weight, moderate or no alcohol consumption, and strong social and educational ties. These are the same factors that most public-health bodies have identified for decades.

Question 5

Does smoking really reduce life expectancy significantly?

Accepted Answer

Large cohort studies, including long-running work on UK doctors and US adults, find that lifelong daily smoking is associated with around 10 years of lower life expectancy on average compared to never-smokers. The figure used in this calculator is deliberately conservative and reflects the population-level estimate.

Question 6

What is the difference between life expectancy at birth and at age 65?

Accepted Answer

Life expectancy at birth is the average years a newborn is expected to live based on current mortality rates. Life expectancy at age 65 is the average remaining years for someone who has already reached 65. The second figure is usually higher than baseline minus age, because reaching 65 means avoiding earlier mortality.

Question 7

Which country has the highest life expectancy?

Accepted Answer

Japan consistently ranks at or near the top of WHO life-expectancy tables, with figures around 81 years for men and 87 years for women. Other long-lived populations include Switzerland, Spain, Italy, Australia, and South Korea. Rankings shift slightly year to year as data is revised.

Question 8

Does exercise really extend your life?

Accepted Answer

Yes. Meta-analyses of cohort studies consistently find that meeting general physical-activity guidelines is associated with roughly 2 to 4 years of additional life expectancy compared to a sedentary baseline. The effect is observed across ages and across most diseases studied.

Question 9

How does income affect life expectancy?

Accepted Answer

Higher income is associated with longer life expectancy in most countries, with a US study finding a gap of around 10 to 15 years between the top and bottom income percentiles. Income is partly a proxy for healthcare access, working conditions, housing, and education rather than a direct cause.

Question 10

What is healthy life expectancy versus total life expectancy?

Accepted Answer

Total life expectancy is the average number of years lived. Healthy life expectancy, sometimes called HALE, is the average number of years lived in good health, without significant disability or chronic illness. HALE is usually around 8 to 12 years shorter than total life expectancy in high-income countries.

Country	Male	Female
United States	74	80
United Kingdom	79	83
Canada	80	84
Australia	81	85
Japan	81	87
Germany	79	83
France	79	85
Brazil	72	79
China	75	80
India	68	71
Nigeria	61	63
South Africa	62	68
Mexico	72	78
Russia	67	77

Free Life Expectancy Calculator — Age and Lifestyle

Average Life Expectancy by Country (WHO Data)

What is life expectancy?

How this calculator works

Factors that affect life expectancy

Common questions