How the “Accident Hump” Tells Us Boys Are Maturing Faster


We’ve known for a while that girls have been maturing at a faster rate for much of the last 100 years, if not longer. Disease reduction and better nutrition are thought to be the biggest factors. But what about boys? Researchers have long thought they were maturing faster too. But lacking the obvious (monthly) data, the evidence proved tricky.

Now, a German researcher believes he’s found the answer by looking at, of all things, male teenage death rates. When girls hit puberty, they get their period. When boys hit puberty, they start doing stupid stuff, hence what’s called “The accident hump,” a spike in mortality rates that coincides with the peak of male hormone production during puberty. That hump it seems has been shifting to earlier and earlier in life.

The new study, by Joshua Goldstein, director of the Max Planck Institute for Demographic Research in Rostock, Germany, finds that the age of sexual maturity for boys has been decreasing by about 2.5 months each decade, since at least the middle of the 18th century.

Here’s the abstract:

This paper shows new evidence of a steady long-term decline in age of male sexual maturity since at least the mid-eighteenth century. A method for measuring the timing of male maturity is developed based on the age at which male young adult mortality accelerates. The method is applied to mortality data from Sweden, Denmark, Norway, the United Kingdom, and Italy. The secular trend toward earlier male sexual maturity parallels the trend toward earlier menarche for females, suggesting that common environmental cues influence the speed of both males’ and females’ sexual maturation.

As Goldstein puts it in a quote from the study’s press release: “Being 18 today is like being 22 in 1800.”

But while we’re maturing faster physically, we’re also delaying many of the hallmarks of adulthood: getting married, having kids, and achieving financial independence are all tending to happen later and later in life.

“The biological and social phases in the lives of young people are drifting apart ever stronger”, says Goldstein. “While adolescents become adults earlier in a biological sense, they reach adulthood later regarding their social and economic roles.” Life cycle research shows that for more than half a century the age at which people marry, have children, start their careers and become financially independent from their parents continues to rise.

Though as Goldstein points out, this biological and social maturation gap may have its advantages:

“Important decisions in life are being made with an increasing distance from the recklessness of youth.” The demographer points out that it remains unclear whether the “high-risk phase” of adolescence becomes more dangerous for males because it starts earlier. While younger men are less mentally and socially mature, parents also tend to supervise their children more closely when they are younger.


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  1. frankenduf says:

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    • Ulysses says:

      To eat meat is to eat hormones. It doesn’t meant they’re going to act on your system in any meaningful way once ingested. And in the 19th century people didn’t consume the same inorganic chemicals and such by-products of big food industry that are blamed for the “puberty hump” shift that has happened in the past century, yet the hump shifted in that pre-food-industry time as well. Hmm.

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  2. James says:

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    • JimFive says:

      Since the trend, according to this post, has been going on “since at least the middle of the 18th century”, that is, since about 1750, I doubt that motorized toys are the issue.


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      • James says:

        The article says that the age of sexual maturity has been going down since the middle of the 18th century, not the “accident hump”. How could there be a way to determine that there even was such a hump, prior to widespread record keeping and medical science capable of accurately determining cause of death?

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      • Adam says:

        The accident hump is what is being used to estimate sexually maturity. But to our question, boys will always find something dangerous to do. Annoy wild animals, swimming, jumping off stuff. Motors are not necessary.

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  3. thetruth says:

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    • YX says:

      Put reputable research behind your claim, or you are just spewing BS.

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      • thetruth says:

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  4. revmeupnow says:

    The primary male hormone, testosterone is mainly produced by the testes. Testosterone levels peak levels during adolescence and the early twenties. After the age 30, a man’s testosterone levels drop by about 1% each year. Although subtle at first, the symptoms of decreased testosterone become increasingly evident by the time a man reaches his mid forties.

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  5. Ryan Gill says:

    I don’t know much about biology and hormones of teenagers and adolescents, but I do have plenty of experience with this “accident hump.” I’ve been through injuries including a concussion, a broken arm, and even a fractured spine as well as some broken toes and sprained wrists and ankles. I can guarantee I have “been doing stupid stuff” since 5 years old, but the majority of my injuries have been suffered during high school. I really don’t know what would explain this random escalation of physical injuries, but this article definitely has some validity. None of my injuries have involved motorized vehicles or a lack of supervision from my parents.

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