At 21 years, 218 days old when she received "Best Actress" Oscar, that honor goes to Marlee Matlin. Matlin won this award in 1987 for her role in the 1986 film, "Children of a Lesser God." She was born August 24, 1965, and received the Best Actress Oscar on March 30, 1987 and has held the youngest Best Actress Winner position for over 29 years.

The other actresses listed are in the top ten winners of the Academy of Motion Picture Arts and Sciences' "Best Actress in a Leading Role," but Ms. Matlin was youngest to ever receive the award. Deaf since was 18 months old, she is also the only deaf performer to win the award.

More Info: en.m.wikipedia.org