A scary and wonderful website can instantly guess how old you are.

A new online tool claims it can guess how old you are. The results are fascinating and sometimes a little frightening.

A new facial analysis tool can scan your face and tell you how old you look –at least, that’s what it’s supposed to do.

Microsoft says its fancy facial recognition technologies — which you can sample for free here —  “provide state-of-the-art algorithms to process face images, like face detection with gender and age prediction, recognition, alignment and other application level features.”

However, the company admits the tool isn’t yet perfect; the site declares: “Sorry if we didn’t quite get the age and gender right – we are still improving this feature.”

More techy stuff: What is the ‘MyIdol’ app and why is everyone obsessed with it?

Which is good to know, because some of our own results were a little off… like our weekend editor Amy‘s, who found that a single facial expression registered as 17 years’ difference.

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Social media users are also rather obsessed with the tool, with more than 15,000 tweets about #HowOldRobot already.

As well as sharing their own facial results, Twitter users have shared some enjoyable celebrity results.

Try the tool for yourself here.

What result did you get?