Of course you all know that earth rotates around the sun once every 365 days (about). And you all know that the other planets of our solar system have different period of rotation, like for example mercury that rotates around the sun once every 87.97 earth-days, and Pluto that takes up to 248.59 earth-years to complete one rotation. So, if you lived on another planet, how old would you be according to this planet's period of rotation?
Here is nifty calculator for you! Enter your birthday and find out your age! I am a teenager on Mars!