Answer the following Q with stream of consciousness. Passage: The oldest living U.S. president is George H.W. Bush, born June 12, 1924 (age 93 years, 261 days). On November 25, 2017, he also became the longest-lived president, surpassing the lifespan of Gerald Ford, who died at the age of 93 years, 165 days. The second oldest living president, Jimmy Carter, has the distinction of having the longest post-presidency in U.S. history, currently at 37 years, 39 days. He surpassed the previous record, held by Herbert Hoover (31 years, 230 days) on September 7, 2012. The youngest living president is Barack Obama, born August 4, 1961 (age 56 years, 208 days).

Question: Based on this passage, who was the longest living president of the united states?
To answer the above question, the relevant sentence is: The oldest living U.S. president is George H.W. Bush, born June 12, 1924 (age 93 years, 261 days). Therefore, the final answer is George H.W. Bush.