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.

Rosie. Forever 24.

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?