The dates for Hatshepsut's life and reign are disputed. In ancient Egypt, dates were recorded according to the start of the current Pharaoh's reign. Egyptologists have attempted to correlate these dates to known dates in other cultures. But it's not so simple. If the relative death date of the Pharaoh is not recorded, or if there are disputed reigns which may or may not be interspersed between known reigns, the dates may be incorrect.
Further, the date of birth of a child of a Pharaoh has rarely been recorded, and can only be guessed at by circumstantial evidence, such as when the child's name first appears in the record.
The end of Hatshepsut's reign is one of those dates not recorded, and even the beginning date is not clear. We have no record of her birth date. There is only one known inscription that may indicate when she died, and that is only relative to the beginning of her co-rule with her stepson.
By one commonly-accepted reckoning, Hatshepsut reigned from 1473 to 1458 BCE. However, other sources use a different dating scheme for the 18th dynasty, of which Hatshepsut is a part, and in sources that accept that dating scheme, Hatshepsut's rule is given as 1503-1482. However, other sources give such dates as 1491-1479, 1479-1458, and 1486-1468.
It's commonly accepted that Hapshetsut was about 15 when her father died, and a few years older when her husband died. Her husband is likely to have been younger than her (her father was unlikely to have taken the minor wife until after he became pharaoh), but we don't know at what age he became pharaoh. One common conclusion is that Thutmose II was about 12 at his father's death.
It's also unsure when Thutmose II's son by a minor wife, Thutmose III, was born; it's also unsure when the daughter of Hatshepsut and Thutmose II, Neferure, was born. But many put the age of Thutmost III at between 2 and 10 years old when Thutmose II died.
Neferure appears to have died after year 11 of Hatshepsut's reign. She is not in any depictions that can be dated after that time. But we don't know how much earlier than the death of her father (Thutmose II) Neferure was born.
We can guess that Senenmut predeceased Hatshepsut, because someone else is named as doing what had been Senenmut's responsibilities, a couple of years before Hatshepsut seems to have died.
It seems that Hatshepsut's rule came to an end about the 22nd year of her reign, though others give later or earlier dates. Her stepson, nephew, successor, and co-ruler Thutmose III was perhaps 25 years old at that time. Hatshepsut was about 50 at her death, which may have been of natural causes, though generations of Egyptologists guessed that she might have been helped to death by a supposedly-resentful and hate-filled stepson.
Read more about her death: How Did Hatshepsut Die?
