Personalised age on other planets poster — how old they are on every planet

A “Your age across the solar system” poster: their age in years on each of the eight planets — at 40, that is 21.3 Martian years and 3.4 Jovian years —, their Earth age large in the middle, their Saturn return and their next round birthday on another planet. All it takes is a first name and a date of birth; it is made to order, and each round age (30, 40, 50) gives different numbers.

You divide the days you have lived by the length of a year on that planet, meaning the time it takes to go round the Sun: 88 days for Mercury, 225 for Venus, 687 for Mars (nearly two Earth years), 4,333 for Jupiter (nearly twelve years), 10,759 for Saturn, 30,688 for Uranus (84 years) and 60,182 for Neptune (165 years). At 40, that makes 166 Mercurian years, 65 Venusian years, 21.3 Martian years, 3.4 Jovian years, 1.4 Saturnian years, 0.48 of a Uranian year and 0.24 of a Neptunian year.

Days are counted as calendar days, midnight to midnight, from the date of birth to the birthday you chose: neither the time nor the place of birth comes into it. The total is divided by the orbital period of each planet as published by NASA (the “Planetary Fact Sheet”). Ages are rounded to one decimal place, and to two below one year.

Saturn takes 10,759 days, nearly 29 and a half years, to go round the Sun. The poster gives the date on which the person has lived that many days — one full trip round the Sun for Saturn — and their age that day, around 29 years and 5 months; it says “done” if that date falls before the birthday you chose, “still to come” if not. Astrologers date the Saturn return from the planet’s position as seen from Earth, which can differ by a few months: the poster gives the full orbit around the Sun, worked out from Saturn’s average period, not a birth chart.

It is the first moment after the chosen birthday when the person reaches a round number of years on another planet: 100, 200, 300… Mercurian years, 50, 100… Venusian years, 25, 50… Martian years, 5, 10… Jovian years, or Uranus’s first full orbit (84 years). The poster keeps the nearest in time, with its date and the Earth age they will be that day: at 40, that is 25 Martian years, at about 47.

No: a first name, a date of birth and the age being celebrated are enough. Days are counted midnight to midnight, so the time would change nothing, and neither would the place.

The age the person is celebrating. The page suggests the next birthday from the date, and you can change it: the poster counts days up to that birthday — the 40th-birthday poster up to the day they turn 40, even if ordered two months earlier. The age runs from 1 to 110, and the birth date cannot be before 1900.

No: the planets are drawn at symbolic sizes — Jupiter is still the biggest, Saturn keeps its rings — and their distances from the Sun play no part in the calculation. Pluto is not on it: the International Astronomical Union made it a dwarf planet in 2006, and the poster shows the eight planets.

In years that are not leap years, their birthday is counted on 28 February. The date of birth is written out in full on the poster.

Yes: the preview is built by the same editor as the print, and a “Check your poster” screen opens before the basket. The line at the bottom is printed exactly as written: you can change it or clear it.

A4, 30 × 40, 40 × 60, 50 × 70 and 70 × 100 cm: standard frame sizes, easy to find. Optional wooden frame on the A4 and 30 × 40, in black, white or natural, with acrylic glass; the larger sizes ship rolled, to frame at home.

250 g/m² satin matte paper, lightfast pigment inks. Printed to order in our workshop in Aveyron, whatever the size. Shipped rolled, in a sturdy long cardboard box; the A4 travels flat, in a stiff card envelope.

Yes. The print-ready file contains all five sizes, each as a PDF and as a 300 dpi PNG — ten files in all, by a download link sent after payment, to print wherever you like.

Your poster is dispatched within 48 hours, then delivered in six to seven days to Ireland and the rest of the EU (four to five in France) — to your home or a pickup point, home delivery only for the 50 × 70 and 70 × 100. For a fixed date, allow ten days outside France. The download link for the print-ready file is sent as soon as payment is confirmed.