If you press the family photo once the screen will come up with all sims (even retired sims) you press any sim and it will give you the option to move them out
Anyone else apart from me really annoyed that if you accidentally press 'create sim' instead of 'make playable', you have no option to cancel? I did this when retiring four sims on Tuesday, so now I have a completely new sim that I didn't want because I couldn't cancel the action . Just as well I can marry her off to one of the others! But I'm still annoyed that it doesn't allow for changing ones mind or accidentally hitting the wrong button.
@Ben-06-io I read somewhere that the new update fixes retired sim bugs like yours! Hope you get the new update & your retired sim will be moving on. If not, better report thru in-game help and/or Twitter EA Help.