Microsoft has created an online tool that lets you upload a picture, and it will guess your age. Judging from my Twitter timeline, it’s often pretty far off of the truth, and is sure to offend as many people as it flatters.
To see if the site can guess your age, go to how-old.net and upload a picture. You can upload one of yourself, your friend, your dog, or even Gollum. Have fun with it.