This mod allows you to age all sims of a particular age to the next or previous age group across the entire game. (Originally only allowed for aging up!) Purpose Updated mod in the year 2020 on April 18 to include aging down. Updated mod in the year 2020 on April 24 to include aging up and down by name. Updated description in the year 2020 on June 13 to include a warning on when to use the mod (to help those receiving the message ' Unable to execute command.').