Interesting question. It turns out, gravity slows time. You would therefore age fastest on the planet with the least gravity. As we no longer consider Pluto a planet, that would mean you would be older on Mercury. Mercury, however, is closest to the sun, which also exerts some gravitational pull. Nevertheless, without working the math, I think I would still stick with Mercury.
If you and a twin were born at the same time on earth and Mercury, (earth being the heaviest of the four rocky inner worlds), my guess is that by the time you had each lived a century, the twin on Mercury would be a few seconds older.
Someone should do the calculations to confirm this--I'm just making wild estimates here.
A second way of looking at the question concerns the number of years you would have attained. Mercury orbits the sun 4 times for every earth orbit, so if you were ten earth years of age you would be 41.5 in Mercury years. The further from the sun, the longer it takes a planet to orbit. But aside from the gravitational/relativistic effect, you would still be about the same age.
All the planets are roughly the same age. We would have to visit each planet and study it to find out which is actually the oldest.
EArth
I think it is Jupiter because it really massive.
the farthest planet away from our sun would be Pluto, but since Pluto is counted as a dwarf planet, Neptune would be the furvest planet away
well technically its not a planet no more but Pluto
The oldest dwarf planet is Ceres. See related links for more information.
All the planets are roughly the same age. We would have to visit each planet and study it to find out which is actually the oldest.
Matt
Egypt(:
maine
EArth
usa
EARTH
simultaneousthere is nothing called as the oldest planet all planets were more or less formed simultaneously. ActuallyNo we dont know
sea world
It says in the bible Earth was here first.
122 years old