Original photo by Svet foto/ Shutterstock
By the time most of us reach age 20 or so, the bones in our body are pretty much done growing. The growth plates that cause us to put on inches in our youth are now hardened bone, and in fact, adults tend to drop an inch or two in height as worn-out cartilage causes our spines to shrink over time. However, there are a few bones that buck this biological trend. Skulls, for example, never fully stop growing, and the bones also shift as we age. A 2008 study from Duke University determined that as we grow older, the forehead moves forward, while cheek bones tend to move backward. As the skull tilts forward, overlying skin droops and sags.
Oops, incorrect!
It's a fibThe world’s largest skull does belong to a dinosaur — just not a T. rex. The record-breaking skull, standing some 10 feet, 6 inches tall, belongs to a Cretaceous Period Pentaceratops, currently on display at the Sam Noble Oklahoma Museum of Natural History.
The skull isn’t the only bone that has a positive correlation with age. Human hips also continue to widen as the decades pass, meaning those extra inches aren’t only due to a loss of youthful metabolism. In 2011, researchers from the University of North Carolina School of Medicine discovered that hips continue to grow well into our 70s, and found that an average 79-year-old’s pelvic width was 1 inch wider than an average 20-year-old’s. So while it’s mostly true that humans stop growing after the age of 20, nature always likes to throw in a few exceptions to the rule.
Numbers Don't Lie
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The pirate flag bearing a skull and crossbones is famously known as the ______.
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The pirate flag bearing a skull and crossbones is famously known as the Jolly Roger.
The idea that your ears and nose never stop growing is a myth.
It’s a common misconception that our ears and noses continue to grow throughout our lifetime — though they sometimes do appear to take on almost cartoonish proportions toward the end of our lives. So what’s going on here? Turns out, it’s not really the cartilage in our nose and ears that’s to blame. Instead, the culprit is decades of experiencing gravity. This constant gravitational pull — along with general degradation due to age — causes the collagen and elastic fibers in our ears and nose to droop and elongate. The surrounding skin supporting these structures also breaks down and droops over time while simultaneously losing volume. Studies have shown that the average human ear elongates approximately 0.22 millimeters a year. It’s a process that’s so reliable, ears can actually be used as a tool for determining a person’s age.
Darren Orf lives in Portland, has a cat, and writes about all things science and climate. You can find his previous work at Popular Mechanics, Inverse, Gizmodo, and Paste, among others.
