She was 16 when she was getting a chance to be because her older brother was in war so she would be next, but then he came back. So she then became Queen at age 18 in 51 B.C! (she was born in 69 B.C!) She wasn't ruling by herself quite yet. She was ruling with her 10 year old brother FUN FUN! Now I have a 10 year old brother and well I sure wouldn't wan to rule a whole country with him. Not at all.
The worst part is she had to marry him. YUCK!!! but that is what they did back then. Unfortunately she really wanted to rule by herself because she killed him not long after getting married.
She was pharaoh for 21 years. Wow that's so long. Do the math, that is from 51-30 B.C. She was alive for 39 years. Now that is from 69-30 B.C ! Tee Hee