On Mercury you would be four times older, on Neptune a 165th of your age. A year means one orbit, and orbits differ.
Earth takes 365.25 days to circle the Sun. That is all a year is — not a cosmic standard.
Being 30 on Mercury means being 7.2 in Earth years. Closer to the Sun means faster orbits.
Your first Neptunian birthday would arrive at Earth-age 165. Since its discovery in 1846 it has barely completed one orbit.
Venus rotates in 243 days but orbits in 225. The day outlasts the year.