Did William Henry Harrison serve a four year term as U.S. president?

The 68-year-old Harrison was sworn into office on March 4, 1841. He was the oldest U.S. president until Ronald Reagan (1911-2004) was elected in 1980 at age 69. Harrison gave a lengthy inaugural address–the longest in history–and opted not to wear a coat or hat, despite the inclement weather. Four weeks later he was dead from pneumonia. Harrison was the first U.S. president to die in office, and he still has the shortest tenure of any U.S. president.