Mark comes up the stairs as you grab the Age O Matic from your room - you do a double-take as you enter and see a little kid's room with toys and stuffed animals. Oh! You set things so everyone thinks you are 5! You grab the device just as Mark comes in. He frowns. "Geeze, little guy! Naked again? Your mom said it's OK, but I wish you'd keep your clothes on when I am babysitting you."
Babysitting? That explains why he is here with a 5 year-old. It is weird to be looking up at him - you used to be the same height. That is easy to fix. You can make yourself back to your real age or make him 5 with you. Or you can make him younger than you, or just a little older.
Hefting the Age O Matic, you grin and ask "You wanna be a little kid, too? Or maybe a little baby?"
Mark looks puzzled, but then sees the device in your hands. "Oh, is this a game? Does your toy gun make people younger?"
You nod. "Or older."
Mark grins. "I'm tired of school. Maybe me 18 so I can be on my own, or a 2 year-old so I have some years before I have to go to school."