How To Tell How Old A Possum Is

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So, you’ve got a possum. Maybe it’s waddling across your porch at midnight, or peeking out from under the shed. You want to know its age, but asking it politely just gets you a hiss. Don’t worry—you don’t need a degree in marsupial science.

The trick is to play detective with its body, especially its teeth and tail. These two clues are like a possum’s personal ID card. Ready to become a possum-age expert overnight?

“A possum’s age is written in its smile… and its grip.”

Start with the Snout and Teeth

Baby possums, called joeys, have a very short, pink snout and tiny, sharp baby teeth. As they get older, their nose gets longer and pointier, and their adult teeth come in. Look for the canine teeth—the fangs. In young possums, they’re bright white and sharp as needles.

In older possums—those over a year old—those same fangs get worn down, chipped, and often stained. A possum with yellow, blunt fangs is a senior citizen. If its teeth are missing entirely, you’re looking at a true ancestor of the backyard.

Believe it or not, the dental formula is the gold standard for scientists. But for us? Just remember: white and sharp means young; yellow and worn means old.

Check the Tail and Ears

Now, look at that crazy, hairless tail. A young possum’s tail is smooth and pink, almost like a fat earthworm. With age, the tail becomes rough, scaly, and covered in scars from climbing and fighting. An old possum’s tail looks like a worn leather belt.

Don’t forget the ears! Ears are a dead giveaway. Young possums have soft, almost translucent pink ears with black edges. Older possums have thick, heavily scarred, or even torn ears. If the ears are ragged like a war veteran’s, that possum has seen some things.

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One heartwarming sign: older possums often have a permanent “worried” expression because the skin on their face gets loose. It’s like they’re squinting into the future.

The “Opossum” vs. “Possum” Confusion

Fun fact: the critter in your backyard is technically an opossum (with an “O”). The word possum (without the “O”) usually refers to an Australian animal. But let’s be real—nobody in North America says “opossum” except for scientists and very fancy people.

Either way, the age-telling tricks work for both. Just know that an Australian possum has a fluffier tail and cuter ears. But we love our scrappy, rat-tailed American version just the same.

Size Matters, But It’s Tricky

You might think bigger means older. Not always! Possums stop growing at around one year old. A fully grown adult is about the size of a large house cat. If you see a tiny one the size of your hand, it’s a juvenile—probably under six months.

Opossum In Daytime

But here’s the heartwarming twist: a very small possum can also be an old one that’s sick. Don’t judge a possum by its size alone. Always combine size with the tooth and tail clues.

Also, male possums are bigger than females. So a big possum might just be a dude, not an old-timer.

The Surprising Truth About Lifespan

Here’s the wild part: wild possums rarely live past two years. They die from cars, predators, or just the sheer exhaustion of being a possum. In captivity, they can live to be four or even five years old. So when you see an old possum in the wild, you are witnessing a miracle.

That scarred tail and chipped fang? That’s a survivor. A possum that’s two years old in the wild is like a human who’s 90 years old, but still climbing trees and eating garbage.

How to Tell the Age of an Opossum - A-Z Animals

“Respect the old possum. It has outwitted every cat, car, and raccoon in the neighborhood.”

A Simple Age Cheat Sheet

Baby (0-4 months): Pink tail, tiny pink nose, bright white baby teeth. Fits in the palm of your hand. Adorable.

Juvenile (4-8 months): Tail still smooth, adult teeth coming in. Size of a small cat. Very curious, still a bit clumsy.

Adult (1-2 years): Long nose, yellowed canines, rough tail. Full cat size. Likely has battle scars on ears.

Senior (2+ years): Missing teeth, bald patches on tail, torn ears, loose skin around face. A living legend.

Next time you see a possum, give it a friendly nod. Use your new detective skills to guess its age. And remember: even a rattly old possum with zero teeth still deserves a little respect. After all, it’s been eating your leftover pizza longer than you have.