Unfortunately, there is no evidence of a 399-year-old woman. The oldest woman ever recorded was Jeanne Calment, who lived to be 122 years old. However, her age has been the subject of some debate, and some researchers believe that she may have been even older.
There are a number of factors that contribute to a long life, including genetics, diet, and exercise. However, there is no one definitive answer to the question of how to live a long and healthy life. Some people who live to be very old have healthy habits, while others do not. It is likely that a combination of factors contributes to longevity.