Winfrey, 71, said that in addition to a loss of concentration, she also suffered from heart palpitations -- a sensation of a racing or irregular heartbeat -- which she said she did not know were a symptom of menopause, the time in life when a woman's periods stop permanently.

ABC primetime television event features frank disclosures about aging from Halle Berry, Naomi Watts, Maria Shriver, medical experts and everyday women

Join Oprah, a panel of experts, and everyday women as they chat about “the change.” Every woman goes through it, but it’s something that not everyone is comfortable talking about just yet. That’s why beloved talk show host Oprah Winfrey is opening up a conversation about menopause.