HAHAHAH I'm 23 also and I had a cat before when I was in College and brought it home when I graduated so Mom and Dad had NO choice because they don't want me to move out. (they're kind of older)
Pookie departed and then I was so sad and missed having a fuzzy bugger I did TONS of research and then told my mom I was off to look at the shelter with my boyfriend. She said "you can look but NO TOUCHING, NO MORE CATS"
I came home with a nice lil crate and OHHH a new Fuzzy bugger. This was only about a year ago when I was 22. Snuck him in to the house set up his littter and food and closed the bathroom door. lil later he opened the door and JUMPED out greeting my mom. SORRY MOM! It's TOO LATE! I LOVE HIM and HE's all MINE!!!!!!!!!!!!!!
She hated him and still pretends to but I know DEEP DOWN maybe REALLY DEEP she loves him and too and company he provides her when I'm not home. When I'm not home she spoils him rotten with canned foods and treats and plays with him non-stop with a laser pointer.
The Moral of my story is NO MATTER what MOM says she loves you and she will ACCEPT and LOVE a new cat!