That’s one of those internet “personality tests” that sounds fun but has no real scientific basis.
What it usually is: a visual illusion or meme where people are asked to count hidden dogs, and the result is supposed to “reveal” your mental age or personality. In reality, what you see depends on things like:
- how your brain groups visual shapes
- attention to detail vs. overall pattern
- familiarity with the image style
- even image quality or screen size
So two people can look at the same picture and “see” different numbers for completely normal reasons—nothing to do with mental age.
If you want, send the image you’re referring to and I can break down what’s actually going on in it.