Married and Degree Educated Males Have High Probability of Outliving Females

Life Expectancy

Life expectancy is a statistical measure of the average time an organism is expected to live, based on the year of its birth, its current age, and other demographic factors like sex. The heritability of lifespan is estimated to be less than 10%, meaning the majority of lifespan variation is attributable to environmental differences rather than genetic variation. However, researchers have identified regions of the genome that can influence the length of life and the number of years in good health.

Main Digest

Men have a high probability of outliving women - especially those who are married and have a degree - reveals a statistical analysis spanning 200 years across all continents of the globe and published in the open access journal BMJ Open.

Between 25% and 50% of men have outlived women, challenging the wisdom that men don't live as long as women. The researchers point out that sometimes large differences in life expectancy mask substantial lifespan differences between the sexes.

The female survival advantage has been observed over time across many different populations. But sex differences in survival are often identified by comparing life expectancy, which summarises the average length of life rather than years lived. This has been interpreted as 'men do not live as long as women,' explain the researchers.

They wanted to quantify the probability that males outlive females over time and across populations and explore the impact of changes in life expectancy and lifespan between the sexes.

They used a particular statistical approach - the 'out survival' statistic - to study sex differences in deaths in 199 populations from every continent over 200 years. This statistic measures the probability that a person with a high death rate will outlive someone from a population with a low death rate.

The researchers drew on life tables by sex and individual years for 41 countries from the Human Mortality Database, plus separate data for East and West Germany and the four countries of the UK. And they used abridged life tables from the World Population Prospects 2019. This provides sex-specific life tables for 199 countries by 5-year age groups and 5-year periods from 1950-54 to 2015-19.

Finally, they compared the probability of men outliving women by education level and marital status, using national US statistics on deaths and population counts.

The data analysis showed that since 1850 the probability of males outliving females has, at all points in time and across all populations, varied between 25% and 50%, with only a few values above 50% in different countries at different times.

These were Iceland in 1891; Jordan in 1950-54; Iran in 1950-64, Iraq in 1960-69; before 1985 in Bangladesh, India, and the Maldives; and between 1995 and 2010 in Bhutan.

In other words, the data show that between 1 and 2 (25%-50%) out of every four men have outlived women for the past 200 years, challenging the wisdom that men don't live as long as women, say the researchers.

In developed countries, the probability of males outliving females fell until the 1970s, gradually increasing in all populations. The rise and fall in sex differences in life expectancy were mainly attributed to smoking and other behavioral differences.

The probability of males living longer than females is generally higher in low/middle-income countries, but this doesn't necessarily mean greater gender equality in survival, note the researchers.

They highlight South Asian countries, where values were above 50% for men in the 1950s and 1960s. The death rate for children under 5 in India was higher for girls than for boys and has remained higher for girls in recent years.

But fewer girls than boys above 15 have died since the 1980s, 'balancing out' the disadvantage at younger ages, they explain. And certain external factors seem to have a key role. For example, between 2015 and 2019, the probability of males outliving females was 40% across the US population.

But this statistic varied depending on marital status and educational attainment: the probability of men outliving women was 39% for those who were married and 37% for those who weren't. And it was 43% for those with a university degree and 39% for those without a high school diploma.

Furthermore, married men with a degree have an advantage over unmarried women educated only at the high school level. Couples influence each other's health, which is particularly true for men, who benefit more than women from being in a stable relationship, point out the researchers.

"A blind interpretation of life expectancy differences can sometimes lead to a distorted perception of the actual inequalities [in lifespan]," they write.

"Not all females outlive males, even if a majority do. But the minority that does is not small. For example, a sex difference in life expectancy at birth of 10 years can be associated with a probability of males outliving females as high as 40%, indicating that 40% of males have a longer lifespan than that of a randomly paired female," they explain.

"Not all males have a disadvantage of 10 years, which is overlooked by solely making comparisons of life expectancy. However, a small number of males will live concise lives, resulting in that difference. For example, more baby boys die than baby girls in most countries," they add.

The data nevertheless show that the death rate has fallen faster for women than for men under 50, especially in the first half of the 20th century, largely due to improvements in infant and child deaths.

Men have maintained their survival disadvantage at younger ages, but at older ages too. They are more prone to accidents and homicides in their 20s and 30s, and they tend to smoke and drink more, leading to higher cancer prevalence and death in their 60s.

A more nuanced approach to sex differences in survival is needed, say the researchers.

"Efforts in reducing lifespan inequalities must thus target diverse factors, causes and ages," they conclude.

Resources That Provide Relevant Information

• Calculate Age in Days Weeks Months Since Birth - Find out how many days you have been alive, what day of the week you were born on, and how long you have lived in days weeks months and years since your birthdate.
• Biological Age Calculator: Check Your True Health Age - Real age calculator provides longevity information and calculates your approximate health age or biological age, as well as your estimated life expectancy.
• Average Life Span Expectancy Chart - How Long Will I Live - How long will I live for is a chart and picture graph of male and female life span expectant averages by country and average age to death.
• Marriage and Life Expectancy Span - Downside of marriage for women as the greater a womans age gap from her husband the lower her life expectancy.

Attribution/Source(s):

This peer reviewed publication pertaining to our Longevity and Life Span section was selected for circulation by the editors of Disabled World due to its likely interest to our disability community readers. Though the content may have been edited for style, clarity, or length, the article "Married and Degree Educated Males Have High Probability of Outliving Females" was originally written by BMJ, and submitted for publishing on 2022/08/03 (Edit Update: 2023/01/04). Should you require further information or clarification, BMJ can be contacted at the bmj.com website. Disabled World makes no warranties or representations in connection therewith.

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Cite This Page (APA): BMJ. (2022, August 3). Married and Degree Educated Males Have High Probability of Outliving Females. Disabled World. Retrieved April 18, 2024 from www.disabled-world.com/fitness/longevity/outliving.php

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