That's funny!

Age 6 was holding my stuffed kitty between my legs and rubbing because it felt good.

Age 12 was probably about the time I discovered a true orgasm and learned how to use my fingers directly.

Age 15, after a slumber party where girls talked about various types of experimentation, the next day I inserted the handle of my round brush and discovered a whole new sensation.

6, 12 or 15 depending on what you count.