Ever wondered how old you would be on another planet? Probably not. But have you ever wanted an excuse for an extra celebration? Thanks to the different orbital periods of the planets in our Solar System, your planetary age can give you up to nine birthdays in a single Earth year. Enter your date of birth below to discover your age on each planet and find out when your next planetary birthday is due.
A note for the scientifically minded: these calculations are based solely on the time each planet takes to orbit the Sun (its year) and do not take into account the planet’s rotation period (the length of its day). Planetary days vary enormously, from Venus’s leisurely 243 Earth days to just under 10 hours on the rapidly spinning giants Jupiter and Saturn. In other words, this is a bit of astronomical fun rather than a peer-reviewed measure of your age!