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Why do twins live longer?

The authors of the study believe the reason twins live longer may be because of the social support they provide each other, and the psychological and health benefits that come with that social connection. "There is benefit to having someone who is socially close to you who is looking out for you," Sharrow said.

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Identical twin boys are more likely to live longer than the general population. (AAP) It turns out sharing a womb can really pay off in later life. Not only do identical twins get double the wardrobe, twice as much fun at their teachers' expense and a best friend from birth, researchers have discovered they also live longer than singletons. Researchers from the University of Washington have examined what being a twin means for life expectancy, and found that they have lower mortality rates throughout their lifetimes. Furthermore, the study, which was published in the journal PLOS ONE, found that identical twins have a higher life expectancy than fraternal twins. "We find that at nearly every age, identical twins survive at higher proportions than fraternal twins, and fraternal twins are a little higher than the general population," the study's lead author David Sharrow, a statistician and postdoctoral researcher in aquatic and fishery sciences, told Science Daily. The study looked at 2,932 pairs of same-sex twins from the Danish Twin Registry, one of the oldest twin registries in the world, who survived past the age of 10 and lived in Denmark between 1870 and 1900 (and so had a complete lifespan). They then compared their ages at death with data for the overall Danish population. For men, the peak benefit of having a twin came when they were in their mid-40s. That difference is about 6 percentage points, which means that if out of 100 boys in the general population, 84 were still alive at age 45, then for twins that number was 90. For women, the peak mortality advantage came in their early 60s, with a difference of about 10 percentage points. related Mirror Twins: the siblings that go beyond identical It can be hard to tell twins apart at the best of times, but when asymmetrical mirror twins visually reflect on another, it makes it far more confusing. The authors of the study believe the reason twins live longer may be because of the social support they provide each other, and the psychological and health benefits that come with that social connection. "There is benefit to having someone who is socially close to you who is looking out for you," Sharrow said. "They may provide material or emotional support that lead to better longevity outcomes." Sharrow also suggests that identical twins may have a longer life expectancy than fraternal twins because of a stronger social bond. "There is some evidence that identical twins are actually closer than fraternal twins," Sharrow said. "If they're even more similar, they may be better able to predict the needs of their twin and care for them." If the findings can be replicated, Sharrow believes they have implications beyond twins to the wider population. "Research shows that these kinds of social interactions, or social bonds, are important in lots of settings," Sharrow said. "Most people may not have a twin, but as a society we may choose to invest in social bonds as a way to promote health and longevity."

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Do twins have exact DNA?

It is true that identical twins share their DNA code with each other. This is because identical twins were formed from the exact same sperm and egg from their father and mother. (In contrast, fraternal twins are formed from two different sperm and two different eggs.)

Are identical twins 100% genetically identical?

It is true that identical twins share their DNA code with each other. This is because identical twins were formed from the exact same sperm and egg from their father and mother. (In contrast, fraternal twins are formed from two different sperm and two different eggs.) Usually, the egg and sperm come together and create an embryo, which eventually grows into a human baby. However, in the case of identical twins, early in development, this embryo divides into two. This creates two babies rather than one. While the two babies share the same DNA code, there is more to our genetics than just that. During development in the womb and after birth, our surroundings, exposures, and nutrition influence how our genes are expressed and how our bodies and minds develop. For example, two identical twins may have the same genes for height, but if one twin does not receive the same amount of nutrients while in the womb, it may be shorter than the other twin. We know also, that there are some changes to our genes that can happen during the embryonic period or during development. While this rarely happens, it makes it so that one identical twin may have a genetic condition, while the other twin does not. Our genetic code is a very large part of our genetic makeup, but there are other factors, genetic and environmental, that make us unique!

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