¿Qué presidente de EEUU envejece más rápido? Eso es lo que se pregunta la cadena de televisión CNN, que ha hecho este vídeo en el que se puede comparar la evolución de los últimos tres presidentes (Bill Clinton, George Bush y Barack Obama), semana por semana.

Ser presidente de Gobierno es un trabajo estresante. Según el investigador Michael Roizen, de la Clínica Cleveland, un centro sin ánimo de lucro en Ohio, cada presidente envejece dos años por cada año de una persona alejada del poder.

Sin embargo, aunque los presidentes parecen envejecer más rápido, puede que sólo sea porque están más expuestos que otras personas en las que el ciudadano se fija menos. De hecho, su esperanza de vida es similar a la del resto de norteamericanos.

Aquí puedes ver una galería de fotos (en inglés) con el envejecimiento de otros presidentes, hecha por nuestra edición en EEUU.

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  • George W. Bush: Jan. 11, 2001:Nov. 5, 2008

    Presidents may enter the office bright-eyed, but they tend to leave with a few more wrinkles and a lot more gray hairs. Compare a younger President George W. Bush, left, before the economic crisis, before Iraq and before Sept. 11, 2001, to Bush in early November.

  • Bill Clinton, family leave bill signing: Nov. 11, 2000

    Scandal certainly takes a toll. Bill Clinton may have dallied with a younger woman, but that couldn't stop the aging process as he approached the end of his tenure, pictured here on the right.

  • Pres. George H. W. Bush

    Maybe serving a single term isn't so bad. The elder George H. W. Bush looked pretty much the same early in his presidency, left, as he did later.

  • Ronald Reagan: Kan. 1981 in L.A.: posing in D.C.

    Could it just be the Hollywood lighting? Ronald Reagan looked younger in a portrait taken in Los Angeles the month of his inauguration, left, than during his last months in office.

  • Jimmy Carter, Feb. 1977: Oct. 1, 1980

    Like the elder George Bush, Jimmy Carter only served for four years. It appeared to weigh heavily on him. That furrowed brow late in his term, right, couldn't have been good for his complexion.

  • Gerald Ford. inauguration: conceding in 1976

    Gerald Ford was the only U.S. president to never win an election, and is pictured here, on the left, at his inauguration. Is it a trick of the light, or did he really look a little beefier, and a little older, as he later conceded to Carter two years later?

  • Richard Nixon, Jan. 20, 1968: April 1974

    Watergate clearly took its toll on Richard Nixon. He looked quite different at his inauguration, left, than he did in the midst of the scandal, six years later.

  • Lyndon B. Johnson (1st photo - Nov. 29, 1963)

    Lyndon B. Johnson looks a little grayer and a little more wrinkled late in his administration, but he does appear to have lost a few pounds. Maybe there's a silver lining after all.

  • John F. Kennedy, 1961 and Jan. 24, 1963

    John F. Kennedy appears to have a fuller face at the start of his presidency, as seen in this 1961 on the left. The second photo was taken in January 1963, 10 months before his assassination.

  • Dwight D. Eisenhower, March 1, 1953 and Nov. 1, 1960

    There was no hair to lose for Dwight D. Eisenhower, as first seen in 1953, but his two terms in office aged the man, as evident in the photograph from 1960.

  • Harry Truman, 91/1945 and 1/1/1953

    Harry S Truman took office with the death of President Roosevelt in 1945, and he described his sudden ascent as feeling "like the moon, the stars and all the planets had fallen on me." All that pressure can wear on a man, as seen in an aged Truman in 1953, shortly before he left office.

  • Franklin D. Roosevelt, 1933 and Feb. 11, 1945

    Franklin D. Roosevelt president over the nation as it struggled with the Great Depression and World War II. He served in office for a record four terms. It's not surprise then that he aged so much in office, as seen in 1933 and 1945. (Sources: AP, Getty, the Washington Post)