Ka cika wannan jumla: Da yake yana da shekara 68 a lokacin da aka naɗa shi, Harrison shi ne mutum mafi tsufa da ya zama shugaban ƙasar Amirka, kuma ya riƙe wannan matsayin har zuwa shekara ta 1981, sa'ad da aka naɗa Ronald Reagan
aka kaddamar da shi yana da shekaru 69. Saboda gajeren lokacinsa, malamai da masana tarihi galibi suna barin lissafinsa a cikin martabar shugabancin tarihi. Duk da haka, ɗan tarihi William W. Freehling ya kira shi "mutum mafi muhimmanci a yadda yankunan Arewa maso Yamma suka zama yankin Upper Midwest a yau".