DuracellEnergizer said:

This picture

sucks.

It seems you come back as a Force ghost as the age you were when you died. But Anakin comes back at the age he was when he turned. So... if you want a long life, and to have your youthful form when you become a Force ghost, you should turn to the Dark Side, be evil for ages, and then, just before you die, throw another evil person down a reactor shaft (or push them under a hover bus). Then you get to come back as the age you were when you began your killing rampage. Sounds like a plan!