your supervisor at your new job, who isn't that old and in fact you think is/looks on the young side for such a supervisor, is being really nice and offering to let you borrow her music. shes showing you what she has, and says, blah blah blah "old lady music." also keep in mind that you are trying to not appear ridiculously young or unprofessional, as you feel, in this job.
correct response: that's ok, i like a lot of different kinds of music!
incorrect response: that's ok, i listen to my mom's music all the time! (to which your supervisor sorrowfully responds, oh, wow, i guess i am old enough to be your mom)
guess which one I chose?