About 1 in every 100 adults has bipolar disorder at some point in their life. Symptoms usually start during or after the teenage years and it is unusual for them to start after the age of 40. Men and women are affected equally. | About 1 in every 100 adults has bipolar disorder at some point in their life. Symptoms usually start during or after the teenage years and it is unusual for them to start after the age of 40. Men and women are affected equally. |