Dane van Niekerk
Made her debut at an unbelievable age of 15 years and 298 days!!!
And has done nothing wrong so far averaging 8.75 with the ball in ODIs and 13 in T20Is ( - played just 2 ODIs and 1 T20)
Wish I could get more info on this child prodigy. A shame there is no coverage in the Cricinfo about her.