Question: When was the oldest serving President of the country where 300 new cases of SJS are found each year elected?

full_context: Document 1: Tuberculosis: In 2007, the country with the highest estimated incidence rate of TB was Swaziland, with 1,200 cases per 100,000 people. India had the largest total incidence, with an estimated 2.0 million new cases. In developed countries, tuberculosis is less common and is found mainly in urban areas. Rates per 100,000 people in different areas of the world were: globally 178, Africa 332, the Americas 36, Eastern Mediterranean 173, Europe 63, Southeast Asia 278, and Western Pacific 139 in 2010. In Canada and Australia, tuberculosis is many times more common among the aboriginal peoples, especially in remote areas. In the United States Native Americans have a fivefold greater mortality from TB, and racial and ethnic minorities accounted for 84% of all reported TB cases.
Document 2: Stevens–Johnson syndrome: SJS is a rare condition, with a reported incidence of around 2.6 to 6.1 cases per million people per year. In the United States, about 300 new diagnoses are made each year. The condition is more common in adults than in children.
Document 3: Epidemiology of diabetes: Until recently, India had more diabetics than any other country in the world, according to the International Diabetes Foundation, although the country has now been surpassed in the top spot by China. Diabetes currently affects more than 62 million Indians, which is more than 7.1% of the adult population. The average age on onset is 42.5 years. Nearly 1 million Indians die due to diabetes every year.
Document 4: List of presidents of the United States by age: The median age at accession to the presidency is roughly 55 years and 6 months, which is about how old Benjamin Harrison was at the time of his inauguration. The youngest person to assume the office was Theodore Roosevelt, who became president following William McKinley's assassination, at the age of 7004156620000000000 ♠ 42 years, 322 days. The youngest person elected president was John F. Kennedy, who was inaugurated into office at the age of 7004159420000000000 ♠ 43 years, 236 days. Assassinated three years into his term, he became the youngest at the time of leaving office (7004169780000000000 ♠ 46 years, 177 days); the youngest person at the time of leaving office after serving a full four - year term was Theodore Roosevelt (7004183900000000000 ♠ 50 years, 128 days). The oldest person at the time of entering office was Donald Trump, at the age of 7004257880000000000 ♠ 70 years, 220 days; Ronald Reagan was the oldest person in office, at the age of 7004284730000000000 ♠ 77 years, 349 days when his presidency ended in January 1989.
Document 5: History of Russia: U.S.–Soviet relations deteriorated following the beginning of the nine-year Soviet–Afghan War in 1979 and the 1980 election of Ronald Reagan, a staunch anti-communist, but improved as the communist bloc started to unravel in the late 1980s. With the collapse of the Soviet Union in 1991, Russia lost the superpower status that it had won in the Second World War.
Document 6: Cold War: By the 1970s, both sides had become interested in making accommodations in order to create a more stable and predictable international system, inaugurating a period of détente that saw Strategic Arms Limitation Talks and the US opening relations with the People's Republic of China as a strategic counterweight to the Soviet Union. Détente collapsed at the end of the decade with the beginning of the Soviet -- Afghan War in 1979. The early 1980s were another period of elevated tension, with the Soviet downing of Korean Air Lines Flight 007 (1983), and the ``Able Archer ''NATO military exercises (1983). The United States increased diplomatic, military, and economic pressures on the Soviet Union, at a time when the communist state was already suffering from economic stagnation. In the mid-1980s, the new Soviet leader Mikhail Gorbachev introduced the liberalizing reforms of perestroika (`` reorganization'', 1987) and glasnost (``openness '', c. 1985) and ended Soviet involvement in Afghanistan. Pressures for national independence grew stronger in Eastern Europe, especially Poland. Gorbachev meanwhile refused to use Soviet troops to bolster the faltering Warsaw Pact regimes as had occurred in the past. The result in 1989 was a wave of revolutions that peacefully (with the exception of the Romanian Revolution) overthrew all of the communist regimes of Central and Eastern Europe. The Communist Party of the Soviet Union itself lost control and was banned following an abortive coup attempt in August 1991. This in turn led to the formal dissolution of the USSR in December 1991 and the collapse of communist regimes in other countries such as Mongolia, Cambodia and South Yemen. The United States remained as the world's only superpower.
Document 7: Bulimia nervosa: Globally, bulimia was estimated to affect 3.6 million people in 2015. About 1% of young women have bulimia at a given point in time and about 2% to 3% of women have the condition at some point in their lives. The condition is less common in the developing world. Bulimia is about nine times more likely to occur in women than men. Among women, rates are highest in young adults. Bulimia was named and first described by the British psychiatrist Gerald Russell in 1979.
Document 8: Soviet Union: With the rise of strong nationalist and separatist movements inside the union republics, Gorbachev tried to avert a dissolution of the Soviet Union in the post-Cold War era. A March 1991 referendum, boycotted by some republics, resulted in a majority of participating citizens voting in favor of preserving the union as a renewed federation. Gorbachev's power was greatly diminished after Russian President Boris Yeltsin played a high - profile role in facing down an abortive August 1991 coup d'état attempted by Communist Party hardliners. On 25 December 1991, Gorbachev resigned and the remaining twelve constituent republics emerged as independent post-Soviet states. The Russian Federation -- formerly the Russian SFSR -- assumed the Soviet Union's rights and obligations and is recognized as the successor state of the Soviet Union. In summing up the international ramifications of these events, Vladislav Zubok stated: ``The collapse of the Soviet empire was an event of epochal geopolitical, military, ideological and economic significance. ''
Document 9: List of presidents of the United States by age: The median age upon accession to the presidency is 55 years and 3 months. This is how old Lyndon B. Johnson was at the time of his inauguration. The youngest person to assume the office was Theodore Roosevelt, who became president at the age of 42 years, 322 days, following William McKinley's assassination; the oldest was Donald Trump, who was 70 years, 220 days old at his inauguration. The youngest person to be elected president was John F. Kennedy, at 43 years, 163 days of age on election day; the oldest was Ronald Reagan, who was 73 years, 274 days old at the time of his election to a second term.
Document 10: List of presidents of the United States by age: Assassinated three years into his term, John F. Kennedy was the youngest at the time of leaving office (46 years, 177 days); the youngest president to leave office at the conclusion of a normal transition was Theodore Roosevelt (50 years, 128 days). The oldest at the time of leaving office was Ronald Reagan (77 years, 349 days).
Document 11: Nuclear arms race: Throughout the 1970s, both the Soviet Union and United States replaced old missiles and warheads with newer, more powerful and effective ones. This continued to worsen Soviet - U.S relations. On June 18, 1979, the SALT II treaty was signed in Vienna. This treaty limited both sides' nuclear arsenals and technology. However, this treaty as well as the era of the détente ended with the Soviet Union's invasion of Afghanistan in January, 1980. The United States once again significantly increased military and nuclear spending, while the Soviets were unable to respond and continued to pursue the détente.
Document 12: Leptospirosis: It is estimated that seven to ten million people are infected by leptospirosis annually. One million cases of severe leptospirosis occur annually, with 58,900 deaths. Leptospirosis is found in both urban and rural areas in tropical, subtropical, and temperate regions. The risk of death is 5 to 10%.Annual rates of infection vary from 0.1 to 1 per 100,000 in temperate climates to 10 to 100 per 100,000 in tropical climates. This leads to a lower number of registered cases than likely exists. The highest estimates of disease morbidity and mortality were observed in South and Southeast Asia, Oceania, Caribbean, Latin America and Africa. Antarctica is the only place not affected by leptospirosis. In the United States, there were 100 to 150 leptospirosis cases annually. In 1994, leptospirosis ceased to be a notifiable disease in the United States except in 36 territories where leptospirosis are prevalent such as Hawaii, Texas, California, and Puerto Rico. About 50% of the cases occurred in Puerto Rico. In January 2013, leptosprirosis was reinstated as a nationally notifiable disease in the United States. Between 1995 and 2005,  a single successful clone of L. interrogans caused a sustained leptospirosis outbreak in Thailand.The number of new cases of leptospirosis is difficult to estimate since many cases are not reported. There are many reasons for this, but the biggest issue is differentiating the disease from other conditions with a similar presentation. Laboratory testing is lacking in many areas. The global incidence of leptospirosis has been underestimated because most affected countries lack notification or notification is not mandatory.
Document 13: List of presidents of the United States by age: The median age upon accession to the presidency is roughly 55 years and 6 months, which is about how old Benjamin Harrison was at the time of his inauguration. The youngest person to assume the office was Theodore Roosevelt, who became president following William McKinley's assassination, at the age of 7004156620000000000 ♠ 42 years, 322 days. The youngest person elected president was John F. Kennedy, who was inaugurated into office at the age of 7004159420000000000 ♠ 43 years, 236 days. Assassinated three years into his term, he became the youngest at the time of leaving office (7004169780000000000 ♠ 46 years, 177 days); the youngest person at the time of leaving office after serving a full four - year term was Theodore Roosevelt (7004183900000000000 ♠ 50 years, 128 days). The oldest person at the time of entering office was Donald Trump, at the age of 7004257880000000000 ♠ 70 years, 220 days; Ronald Reagan was the oldest person in office, at the age of 7004284730000000000 ♠ 77 years, 349 days when his presidency ended in January 1989.
Document 14: Soviet Union–United States relations: The relations between the United States of America and the Union of Soviet Socialist Republics (1922 -- 1991) succeeded the previous relations from 1776 to 1917 and predate today's relations that began in 1992. Full diplomatic relations between the two countries were established late due to mutual hostility. During World War II, the two countries were briefly allies. At the end of the war, the first signs of post-war mistrust and hostility began to appear between the two countries, escalating into the Cold War; a period of tense hostile relations, with periods of détente.
Document 15: List of presidents of the United States by age: The median age upon accession to the presidency is roughly 55 years and 6 months, which is about how old Benjamin Harrison was at the time of his inauguration. The youngest person to assume the office was Theodore Roosevelt, who became president at the age of 7004156620000000000 ♠ 42 years, 322 days, following William McKinley's assassination. The youngest person elected president was John F. Kennedy, who was inaugurated into office at the age of 7004159420000000000 ♠ 43 years, 236 days. Assassinated three years into his term, he became the youngest at the time of leaving office (7004169780000000000 ♠ 46 years, 177 days); the youngest person at the time of leaving office after serving a full four - year term was Theodore Roosevelt (7004183900000000000 ♠ 50 years, 128 days). The oldest person at the time of entering office was Donald Trump, at the age of 7004257880000000000 ♠ 70 years, 220 days; Ronald Reagan was the oldest person in office, at the age of 7004284730000000000 ♠ 77 years, 349 days when his presidency ended in January 1989.
ground_truth: 1980
sub_queries: Where are 300 new cases of SJS found each year? Answer: United States
who was the oldest serving president of United States Answer: Ronald Reagan
When was Ronald Reagan elected? Answer: 1980