Judging by the video below, it looks like someone decided to inform the poor little girl about the terrifying concept of aging. And, it did not go well.
Not helping matters is Sadie's younger brother, who — though cute as a button — serves as a stark reminder that youth is fleeting. One day he'll have pimples and be filled with testosterone and take the keys to Sadie's flying car when she's not looking. He'll ruin her Blue Ivy hologram, eat her last Doritos cube, and make fun of the hot cyborg she's crushing on.
So, in short, Sadie: When your brother gets older he's going to be a bit of a pest. But, judging by your reaction here, it looks like you already knew that.