Question: What is the birthdate of this Ukranian former pole vaulter, who started his path to Olympic success from Soviet Sports schools?

Context paragraphs:
Lexi Weeks: Alexis "Lexi" Weeks (born November 20, 1996) is an American pole vaulter.  She has an identical twin Tori, who is also a pole vaulter.  Lexi qualified for the 2016 Summer Olympics by finishing third at the Olympic trials.

Steve Smith (pole vaulter): Stephen Norwood "Steve" Smith (born November 24, 1951) is a retired American Olympic pole vaulter.  He was the first person to clear the 18 foot barrier indoors.  He was the number one ranked pole vaulter in the world in 1973.

Steve Hooker: Steven "Steve" Leslie Hooker OAM (born 16 July 1982 in Melbourne, Victoria) is an Australian former pole vaulter and Olympic gold medalist.  His personal best, achieved in 2008, is 6.06 m (19 ft floor(((6.06)*3.28084)−(floor((6.06)*3.28084)) *12) in) making him the third-highest pole vaulter in history, behind Sergey Bubka and Renaud Lavillenie.

Jenn Suhr: Jennifer "Jenn" Suhr (née Stuczynski; born February 5, 1982) is an American pole vaulter.  She has been an Olympic and World champion, has been ranked #1 in the World, has been the #1 American pole vaulter since 2006, and has won a total of 15 US National Championships (6 Indoor, 9 Outdoor).  She holds the world indoor pole vault record at 5.03 m .  She holds the American women's pole vault record indoors.  In 2008, she won the U.S. Olympic trials, setting an American record of 4.92 m and won a silver medal in the Beijing Olympics.  She won the gold medal at the London Olympics on August 6, 2012. " Track & Field News" named her American Female Athlete of the Year for 2008.

Toby Stevenson: Toby "Crash" Stevenson (born November 19, 1976 in Odessa, Texas) is an Olympic class pole vaulter from the United States.  He is known for being the only pole vaulter in the international elite to wear a helmet during jumps.

Tori Anthony: Tori Anthony is an American pole vaulter from Woodside, California and the holder of the national indoor and outdoor records for high school women at 14' 2-1/2" (4.33 m) and 14' 1" (4.29 m) respectively.  She was originally a gymnast, but burned out on the sport and switched to track and water polo.  Competing in her first track events as a sophomore, she placed fourth in the pole vault at the 2005 CIF California State Meet within four months of taking up the sport.  Even before setting the outdoor record, she was named an "Athletes Only" indoor track athlete of the year for 2006-07, and named "best high school girl pole vaulter in the country" by Sports Illustrated.  She missed her high school graduation from Castilleja School to set the outdoor record on June 2, 2007.  She competed for UCLA, achieving 13' 9" in their uniform to rank number in school history.

Sports school: A sports school (Russian: Детско-Юношеская Спортивная Школа, ДЮСШ ) is a type of educational institution for children that originated in the Soviet Union.  Sports schools were the basis of the powerful system of physical culture (fitness) and sports education in the USSR and the Eastern Bloc, particularly East Germany.  The main features of this system remain in the system of sports education in Russia and other post-Soviet states, and also became the basis of similar systems in other countries, one of the most powerful ones at the present time being that of the People's Republic of China.  Many legendary athletes, such as Nikolai Andrianov, Nellie Kim, Alexander Popov, Viktor Krovopuskov, Vladislav Tretiak, Valeri Kharlamov, Anatoly Alyabyev and Sergey Bubka started their path to Olympic success from Soviet sports schools.

Sergey Bubka: Serhii Nazarovych Bubka (Ukrainian: Сергі́й Наза́рович Бу́бка ; Russian: Серге́й Наза́рович Бу́бка, "Sergey Nazarovich Bubka" ; born 4 December 1963) is a Ukrainian former pole vaulter.  He represented the Soviet Union until its dissolution in 1991.  Bubka was twice named Athlete of the Year by "Track & Field News", and in 2012 was one of 24 athletes inducted as inaugural members of the International Association of Athletics Federations Hall of Fame.

Brandon Estrada: Brandon Estrada (born October 28, 1987 as Brandon Michael-paul Estrada) from Los Angeles, California is a two time NCAA Div 1 All-American in the pole vault, an All-Time United States Indoor Track and Field Pole Vault record holder, the Indoor National Record Holder for Puerto Rico and Silver Medalist for Puerto Rico at 2010 Central American and Caribbean Games.  A former pole vaulter for The University of Southern California (USC) Track and Field team holding the # 4 all-time record.  Brandon is the son of actor Erik Estrada (best known in his role as 'Ponch' in the hit TV series CHiPs) & Peggy Lynn Rowe (entertainment executive, producer and songwriter.)

Derek Miles: Derek Miles (born September 28, 1972) is an American pole vaulter, from Tea, South Dakota.  A former pole vaulter for The University of South Dakota Track and Field team, Miles is currently an assistant coach for the Coyotes.  In 2004, he placed seventh in the Summer Olympic Games in Athens, Greece.  Miles was originally at fourth place in the 2008 Summer Olympic Games in Beijing, China, but Ukrainian Denys Yurchenko who originally finished third, was disqualified in November 2016 due to use of dehydrochlormethyltestosterone.  On 17 April 2017, Derek Miles received the Olympic bronze medal.

Supporting paragraphs: Sports school Sergey Bubka
Answer: 4 December 1963