Read it through once

LADY BRACKNELL. You are perfectly right in making some slight alteration. Indeed, no woman should ever be quite accurate about her age. It looks so calculating . . . [In a meditative manner.] Eighteen, but admitting to twenty at evening parties. Well, it will not be very long before you are of age and free from the restraints of tutelage. So I don’t think your guardian’s consent is, after all, a matter of any importance.