Final answer:
Monica Lewinsky was 22 years old when her affair with President Bill Clinton began in 1995. The scandal emerged during Ken Starr's investigations and ultimately led to Clinton's impeachment by the House, with later acquittal by the Senate.
Step-by-step explanation:
Monica Lewinsky was a young White House intern who became embroiled in a scandal due to her affair with President Bill Clinton. The affair came to light during investigations by independent counsel Ken Starr, initially probing into other matters such as the Paula Jones lawsuit and the Whitewater Development Corporation. Monica Lewinsky's relationship with Bill Clinton began in 1995 when she was 22 years old and continued until 1997. The controversy escalated when it was discovered that Clinton had not only engaged in an extramarital affair with Lewinsky but also lied under oath about it. This revelation led to his impeachment by the House of Representatives on charges of lying under oath and obstructing justice, although he was later acquitted by the Senate.