I've never done a legacy, but I've been playing the same main family since September 2015. --- (I have other "sometimes" files.)
My game crashed in July 2016, and I lost all my characters, including neighbors and extended family and all my builds in all the worlds I had at the time (5 or 6 including base game. Now, I have all the worlds and packs.
So, I started from scratch and rebuilt the last 4 generations of the family, extended family and any neighbors whom were important to my main family. My main family has most of the skills in game, and aging has been off since I restarted the file.
However, before aging was off, I had about 30 generations of my main family, so, it was kind of like a legacy without all the rules of a legacy challenge.
