Have you ever taken a test that stayed with you for a lifetime? For many, that test is their IQ test. It’s not something we can study for, but it can shape us in surprising ways.

One such test is a sketch devised by professors from Flinders University in Australia. At first glance, most people see an elderly woman in the sketch. But if you look closer, something else may begin to appear.

Hidden within the image of the old woman is a picture of a young woman. Once you see it, you can’t un-see it. But here’s the interesting part: there’s a secret behind it.

The professors conducted a test, showing the picture to many people and listening to their observations over time. And they found something intriguing. If you’re under the age of 32, you’re more likely to see the young lady first. But if you’re over the age of 32, the elderly woman stands out.

Are you struggling to see the younger woman in the picture? Let me give you a hint. The profile of the younger lady is in the left cheek of the older woman’s picture. And the nose of the older woman is the chin of the younger woman.

It’s fascinating how our perception can be influenced by our age. Once you see both women in the image, it’s hard to un-see them. Next time you come across a puzzling picture, remember this one and see if you notice any hidden secrets.