When do you start playing a new sim?

For my main sim, I will only stop playing her if she's going to die at the elderly stage. She's still a young adult, and I only age them when I feel like it's the time. She's going to marry soon and have kids.

In the future, after she'll die, I'm going to play one of her kids (planning for her to have at least 10 kids or more).

I do switch to other saves for a while if I get bored. I have 2 other saves, one of which is where I'm having contests for sims like Survivor or Big Brother challenges lol