Dwight D. Eisenhower:

On the morning of March 28, 1969, at the age of 78, Eisenhower died in Washington, D.C. of congestive heart failure at Walter Reed Army Medical Center. The following day his body was moved to the Washington National Cathedral's Bethlehem Chapel, where he lay in repose for 28 hours. On March 30, his body was brought by caisson to the United States Capitol, where he lay in state in the Capitol Rotunda. On March 31, Eisenhower's body was returned to the National Cathedral, where he was given an Episcopal Church funeral service.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". How old was Eisenhower when he died?
78