Find out how old you would be on Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Neptune, and when your next birthday on each planet is.
A planet's year is the time it takes to orbit the Sun. Mercury takes just 88 days, so you'd have many more birthdays there, while Neptune takes about 165 Earth years, so almost nobody lives to see a Neptune birthday.
Divide your age in days by 687. A 30-year-old on Earth is about 16 in Mars years.