My Sims Keep Disappearing!

I am not having a problem with played households disappearing but the premades I did manage world and added kids, spouses through CAS and most of them disappeared, out of world or in houses. I made a group of males in a household but they were in out of world until I built a lot for them and while playing my single girl she did get to know one of them and next time I opened the game the household was gone from out of world, replaced with a lot of elderly women. I really didn't want my flirty sim causing break ups of the married males in the game but looks like that is what the game wants. I can't keep a household of singles for my sims to meet and marry.

I am not an age bigot but I would like to have them around longer than a sim week after marriage. :) All the bars are like retirement homes. How do out of world and unplayed households managed by the game and how do I take it over?