Some months ago I read about a software that could guess the age of a person just by analysing her/his picture. I was puzzled among other things, because I thought that's something not even me--supposedly a human being--could do accurately. Since then, I usually find myself walking and watching people trying to guess their age. But of course, there's no way I can check whether I am wrong or right.
 
These days, though, I found a game in which you have to look at pictures of some people and try to guess their ages. Then, the program lets you know your level of accuracy (the best part). To my surprise, I'm not so bad at it (except for that poor 17 year old I took for a woman of 56)... oh well.
 
 Oh. And you can also send your picture if curiosity kills you or you're trying to kill your cat.
 
More interesting links related to age: 

- Look at what your age would be in other planets (I haven't been born in some of them)

- If you didn't know about Goldberg family, look at their interesting project.