Can a woman go through midlife crisis at the age of 39?

Menopause?: Do you mean menoopause? i.e. cessation of menstruation and symptoms that go along with it? AGe 39 is earlier than usual, but happens to some women. Symptoms can be prevented or controlled with medication; see a gynecologist. (Midlife crisis is entirely different. If that's what you mean, of course it also can occur at your age. Discuss with your doctor.)