みんなの脳年齢診断

This Chrome extension offers a quick, engaging brain-age assessment through a simple numbers game. You’ll tap the number you think is correct in each round to see your brain’s apparent age, with instant feedback to keep you motivated.

How to play is straightforward: you’ll be prompted with questions like “Which is the largest number?” or “Which is the smallest number?” Tap the answer you choose to progress. It’s a fun, approachable way to get a snapshot of cognitive speed and attention in just a few minutes.