What is the end point of a household/game for you?

I actually approach the game as a story telling engine. I have done some writing and know how to build a story arc. I use my own imagination plus the gameplay to create the story. So, for me, a household ends when their story arc concludes. That doesn’t necessarily mean death, though, so I can play with aging off.

For example, my last game before the current one was about a musician who went into the witness protection program after witnessing a murder, He was living in an underground bunker with two FBI agents. I played their skills and relationships out with the game as I developed the story arc in my mind. When the mob guy got caught and the musician was able to resume his career, the game was over for that save.

My current save has more longevity, because, as the original arc was ending, it moved from a single character’s story to a world story that includes that character. That has a lot more scope and variety of play and a lot of potential story arcs.

Death is usually the endpoint for me. Although some have been known to stick around for a while afterwards.

Seriously though, just because I play with aging off doesn't mean my Sims don't age. I just age them manually with cake. That way I have time to play out my story to my satisfaction. (Nina has a fight with Dina over her criminal career and moves to a grungy apartment in the city. Disgusted by her new lifestyle, it is easy for Nancy to persuade her to work as a part time maid while living amidst luxury. But then she makes a deal with Geoffrey...)

Since I play in rotation, I play until I feel a chapter is finished in that household's life. Then I make note of whatever age I think the Sims have reached during that chapter with maybe a brief reminder of what I want to do next time.

I'm not sure I understand. My games never have a story (that would bore me to tears), instead everything is situational, and done on a whim. Example; I send a sim to one of my outdoor nightclubs in the middle of a blizzard--that's the situation. When I get bored with that, I switch households and create another situation

Well, you'd be right. When I get bored. :D

I really don't think there's really an end to a sim's story until they're dead, and sometimes that's not final either.

I put a save on a long pause (sometimes permenant pause) when I run out of ideas on where to take the story. If I don't revisit a save for more than a few months, I take it as it didn't really mean that much to me, and I delete it.

I move on when the story is done.

For some saves, that means once my initial sim has accomplished some goal (usually an aspiration for Test Saves)
For some saves, that means after so many generations have done their thing... whatever "their thing" may be. This style of informal Legacy play is my most common.
And yes, for some saves, that means when I say "Nope. Not interested in this save any more."

I've also been known to jump between saves, usually my current legacy save and whatever short term save (testing, scenarios, etc) I have in mind. This usually keeps saves from getting too stale in play.

There is no end game for my one family one save. I don't create stories or situations. I just play the game. My sims work, skill, run businesses, go on vacation, go to Uni, but it's all very straightforward. I'm a goal oriented player and my goal is to complete all the careers, aspirations, skills, etc with this one family and offspring.

It tends to be when my sims reaches career level 10, they have a nice house and I don't feel like changing their lives, like aging them up or having them expand the family.

I don't make a lot of stories anymore so my save where aging is turned off have kinda reached some sort of end where all my played households are happy, and I don't really feel like creating new households except when new packs are released.

My game never really ends, I just get another good idea and move on to that for awhile. I have a lot of saves and I could easily jump back into any one of them and keep playing.

My problem is I'm too creative, and as such, I'm always coming up with a new idea I want to play out. There are some old saves I'd like to jump back into, but I just don't have enough time to play with every one of them.

Boredom, probably. Obviously I go in with certain ideas and try to get through those, but if I come up with new ones or am still having fun I don't consider it the end. The one true thing that will get a save/family wiped is boredom.

The end of one story is the beginning for another!
It’s a long story and Its no where close to over.

But it’s when the Mad vampire queen, is in a hot pursuit to retrieve her daughter the Princess and rightful Queen, and her best friend and they escape to another dimension. But what the mad queen doesn’t know, the princess’s best friend, her father a powerful archmage was secretly using them as bait. To trap the mad queen, after helping them escape to a different world. Somewhere the queen can’t follow even with all her power.

And the Archmage strips the the queen of her powers and banishes her oblivion (the realm of Magic/Forgotten hollow) essentially for treason.

And then the story picks up again in 1980 two young women a princess and her lady a powerful sorceress, dressed in fine medieval/baroque ball gowns find themselves walking through a forest on the outskirts of a fictional town resembling New York.

They quickly, adapt to this new world their in, and begin a new life, leaving their old one in the stars.
The Princess falls in love with a werewolf/beast who has been trapped and living as a wolf for most of his life. And have 6 werewolf children.

Her lady and a sorceress, falls in love with the cop, who is her dashing knight in leather armor, with a gun. They have two kids. Their youngest son becomes best friends with the other family’s youngest son.

And all is well until the mad queen claws her way into the world they escaped to.

The end result of this tale, I don’t really know