Astronomical curiosity of a day #2

Age on other planets?

How old am I?

We used to calculating person age typically based on years from its born. But what 'year' actually means? 365 days (and sometimes 366), right? But why? Because this is an amount of time when Earth makes full circle around the Sun. Ok, so measurements of age is based on Earth motions around its axis and around the Sun. As we know, different planets moves very differently. It depends on its size, mass, distance from Sun. What would we obtain if for calculating age e.g. Neptunian days/years would we use?
You can check it here: click.

Let's say someone was born 1st January 1990. How old would this person be measuring by other planets days/years:

Planet	days from born	years from born	remark
Mercury	172.6	115	-
Venus	41.6	45	pretty cool! on Venus day is longer than year!
Earth	10118.3	27.7	obviously
Mars	9823.6	14.7	-
Jupiter	24678.9	2.33	crazy things are happening, only 2.33 year old due to Jovian years
Saturn	22485.2	0.94	-
Uranus	14053.2	0.32	-
Neptune	15102	0.16	-
Pluto	1583.4	0.111	during 27.7 Earth years, Pluto move only 1/9 distance around the Sun

Visualization

To imagine situation described above I prepared simple GIF in solar system simulator. Starting point is 1st January 1990 and last 14th September 2017. Please notice that sizes of planets are not in correct scale.