# The Real Reason Women Live Longer Than Men

Ask your smartphone how to drive from Copenhagen to Berlin and it will give you an estimate of how long the trip will take, based on current traffic. If there is a traffic jam in Hamburg, say, the extra time this traffic jam takes will be included in the estimate. But, of course, you are not at all the points of your journey now. Rather, you’ll be in Copenhagen first, then at Odense, then Kolding, and so forth. By the time you get to Hamburg, there may no longer be a traffic jam. The estimate your smartphone gave you will be off. Life expectancy is calculated in much the same way.

Life expectancy in 2019 is calculated using the chances of survival for all ages in 2019: those who turned 70 in 2019, those who turned 69 in 2019, those who turned 71 … you get the point. But nobody actually has all their birthdays in 2019. People have at most one birthday a year (less than one for some of those who died that year and those born on February 29). Since I turned 35 in 2019, why should the 2019 chances of survival for a 70-year-old matter to me? By the time I turn 70, the world will have changed. The estimate will be off.

But your smartphone also tells you something like “31 minutes extra travel time due to a traffic jam”. With this information, you can guess how long the trip will take assuming that the traffic jam will be resolved by the time you get there: just subtract those 31 minutes. Every part of the journey has a travelling time and you can pick those pieces apart.

Similarly, life expectancy is built up out of many small pieces, one for each age, and demographers can pick those pieces apart. We did that to answer questions such as: “what is the part of life expectancy lived between ages 50 and 85?” (which will be a number between 0 and 35). And “suppose that in 2015 no 70-year-old died of smoking (for example through lung cancer), what would that life expectancy have been?” And “how has the importance of smoking-related deaths been changing, and was that different for men and women?”

Throw all that in the mixer and you get some interesting results, which my colleagues and I – a team from the University of Southern Denmark and University of Groningen – published in BMC Public Health.

We studied the part of life expectancy lived between ages 50 and 85 for high-income North America, high-income Europe and high-income Oceania for the period 1950-2015. Around 1950, males lived about two and a half years less than females. Around 1980, this difference had increased to about four and a half years. Then the difference in life expectancy declined to new lows of about two years in 2015.

All of that increase and subsequent decrease was due to smoking. Remove smoking and you get an almost flat line at only two years, which is what the difference in life expectancy between ages 50 and 85 would have been if nobody had smoked.

## Long time coming

If smoking is so bad, why are we seeing all of these early deaths? Why aren’t people smarter? Well, if cigarettes killed you right away, nobody would touch them. The problem is that cigarettes do kill you – only decades later.

Because, historically, men started smoking earlier and heavier than women, any effect of smoking on life expectancy shows in males first. While medical doctors were coming to the conclusion that smoking is bad – basing their conclusions on evidence from men – women decided it was time to take up smoking. Now, decades later, the effect of smoking (death) is declining in males but still increasing for older females who smoked in the past. This gives rise to a four-wave pattern dubbed “the smoking epidemic”: first men smoke, then men start dying from smoking at around the same time women start smoking, then women start dying from smoking.

In some countries, such as the UK and the Netherlands, more women than men may soon die of smoking. Photographee.eu/Shutterstock

In the final phase of the smoking epidemic, people get smarter and stop smoking. This last part of the smoking epidemic, however, is the more difficult part. Unfortunately, people keep smoking (big tobacco is doing just fine).

But our study also showed some good news. Recently, there was a big drop in smoking-related deaths for people of around 50 years old. While smoking is certainly not down and out, at least some people seem to get that tobacco is a killer.

### About the Author

Maarten Wensink, Assistant Professor, Epidemiology, Biostatistics and Biodemography, University of Southern Denmark

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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