False lactation?

I've read that this can happen for women even years after weaning. Hearing a baby crying in the mall can trigger it, that kind of thing. (Maybe there's a certain kind of hunger cry that can be more likely to trigger it.) When it does happen, holding a newborn is a common trigger.

I never could recognize the feeling of letdown with any of my nurslings. I just never felt it.

But it has been just over a year since my last one weaned and I can still express a small amount (I've never tried for more than a drop; I do think at this point that it's literally "just a drop" but still.)