Is Your Mouse Disclosing Your Age and Gender?

I like to compare an online experience to an offline experience. If I go to a store by walking in the door, I feel like I've inadvertently disclosed my age and gender. So if my mouse is disclosing that to a website, maybe I'm not aware of it,. But I guess I don't know that I feel violated. How do you feel about it? Well, I think it's it's beneficial in a sense that I prefer to have well target advertising.