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She was 17.
She was forced into marrying her brother, Ptolemy XII at age 12, but took the Egypt throne when she was 17.
There was Upper and Lower Egypt in pre-dynasty but these were united when the first pharaoh, Narmer, came to power. Since then they had been united.
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in the old kingdom
It is beleived that he took over the throne of Ancient Egypt at roughly 9 years of age.
The capital of Ancient Egypt was Memphis. They had Memphis as a capital for over eight dynasties all through out the Old Kingdom.
69 yeas old!!
It is likely, given that the Old Kingdom of Egypt mentions Anubis, that the worship of Anubis in Egypt predates the Pharaoh ruling over Egypt.
The Old Kingdom was considered to be a Golden Age, because it was a Golden Age of culture and civilization.
The three kingdoms were the Old Kingdom, the Middle Kingdom, and the New Kingdom.
So the king can have all power over Egypt.