Aidan has been diagnosed with bipolar disorder. aidan's identical twin has a chance that he will also experience bipolar disorder at some point in his life.

I believe the correct answer is 40-70%.

If Aidan has been diagnosed with bipolar disorder, his identical twin has a 40-70% chance that he will also experience bipolar disorder at some point in his life. Some studies in Germany in 1920 have shown that identical twins are more likely to share both having the illness than are fraternal twins.