when did you start transitioning to your true gender?

I'm a just starting transgender individual looking for an age range on when everyone had started transitioning from one gender to the next.

I want to know if you started transitioning from an early age or if you started later due to understanding yourself better.

Please don't commit "take your time" or "everyone starts at there own pace. I am looking for numbers, not feel good comments, though they are appreciated.

This is purely for my own reference and comments are greatly appreciated.