Samantha knew she had to get older quick before her memories became a teenager's completely. Or worse a younger child arrived.
"I wish to be 21." Samantha whispered but nothing happened. It took a moment but the currently fifteen year old realized her previous wish was to be 1 year younger than the next youngest person, which was 16.
Okay then. "I wish for the 16 year old here was the second youngest person year no matter her age."
And now. "I wish for my adult memories and feelings to stay intact though I still know them." A bit of teenage insecurity disappeared.
Samantha considered her options and thought of something else.