[Harmony♥]

Everyone starts puberty at different times; anyone who went through health or puberty education classes will know this.

All of my friends started maturing at different times. A friend of mine got her period at 10, I got mine at 11 and another friend didn't get hers until she was a freshman in high school. It just varies from person to person. My boyfriend's cousin didn't go through the "voice change" until this year, but his sister started maturing about a year ago. You won't find any two people who began growing boobs or started their periods at the very same time, especially if they know each other.