The 2012 Olympic Team is comprised of 269 women and 261 men, marking the first time in history that Team USA features more female athletes. The Olympic Team features 228 returning Olympians, including seven five-time Olympians, 21 four-time Olympians, 57 three-time Olympians and 143 two-time Olympians. Among the returnees are 124 Olympic medalists, 76 of whom are Olympic champions. Forty-four states are represented, including 128 athletes hailing from California, 35 from both New York and Pennsylvania and 33 from Texas. The oldest and youngest Olympians on the 2012 Olympic Team - equestrian athlete Karen O'Connor, 54, and swimmer Katie Ledecky, 15 - are separated by 39 years, while the average age is 27. Team USA features two sets of twins in tennis players Bob and Mike Bryan and rowers Grant and Ross James. Other team siblings include swimmers Alyssa and Haley Anderson, taekwondo athletes Diana and Steven Lopez, sailors Paige and Zach Railey, field hockey players Julia and Katie Reinprecht, water polo players Jessica and Maggie Steffans and tennis players Serena and Venus Williams.