How Old Are You on Mars?

Work out your age on other planets, then test what you learned with ten questions.

Turn on JavaScript to work out your exact age — or find it in the table below.

Now test yourself

10 questions about years, days and birthdays on other planets.

Earth	Mars	Jupiter	Mercury	Venus
5	2.6	0.4	20.7	8.1
10	5.3	0.8	41.5	16.2
15	7.9	1.2	62.2	24.3
20	10.6	1.6	83	32.5
25	13.2	2.1	103.8	40.6
30	15.9	2.5	124.5	48.7
35	18.6	2.9	145.3	56.8
40	21.2	3.3	166	65
45	23.9	3.7	186.8	73.1
50	26.5	4.2	207.6	81.2
55	29.2	4.6	228.3	89.4
60	31.9	5	249.1	97.5
65	34.5	5.4	269.8	105.6
70	37.2	5.9	290.6	113.7
75	39.8	6.3	311.4	121.9
80	42.5	6.7	332.1	130

Ages are rounded down. A planet's year in Earth days: Mercury 88, Venus 225, Mars 687, Jupiter 4,333.