Why are my elders spontaneously pregnant?

Unless you specifically exclude played households it will affect them, and Neighborhood Stories doesnt seem to care if they are elders, just that they are YA or older

That is definitely odd! I just saw an elder in my game who looked pregnant, but nope, she's just chubby.

I had a few calls asking whether my active sim thought so and so should try for a baby. I hate such calls, and story progression is off, so I always decline. I thought I told them to not try, but the next thing I knew was the soon to be elderly woman who phoned, had a baby. I think I might have misunderstood those options and given the wrong feedback.