Heather O'Reilly
MF · Born January 2, 1985
Age in each playoff game
- 2007 Group stage (September 11, 2007), United States vs North Korea 2–2: 22 years, 252 days
- 2007 Group stage (September 14, 2007), United States vs Sweden 2–0: 22 years, 255 days
- 2007 Group stage (September 18, 2007), United States vs Nigeria 1–0: 22 years, 259 days
- 2007 Quarter-final (September 22, 2007), United States vs England 3–0: 22 years, 263 days
- 2007 Semi-final (September 27, 2007), United States vs Brazil 0–4: 22 years, 268 days
- 2007 Third-place match (September 30, 2007), United States vs Norway 4–1: 22 years, 271 days
- 2011 Group stage (June 28, 2011), United States vs North Korea 2–0: 26 years, 177 days
- 2011 Group stage (July 2, 2011), United States vs Colombia 3–0: 26 years, 181 days
- 2011 Quarter-final (July 10, 2011), United States vs Brazil 2–2 (5–3 pens): 26 years, 189 days
- 2011 Semi-final (July 13, 2011), United States vs France 3–1: 26 years, 192 days
- 2011 FIFA Women's World Cup Final (July 17, 2011), United States vs Japan 2–2 (1–3 pens): 26 years, 196 days
- 2015 Quarter-final (June 26, 2015), United States vs China 1–0: 30 years, 175 days
Age in each season
- 2007 (United States): 22 years, 251 days to 22 years, 271 days
- 2011 (United States): 26 years, 175 days to 26 years, 196 days
- 2015 (United States): 30 years, 155 days to 30 years, 184 days