US Presidents Who Died Young

Name the 13 presidents who died before age of 65.
Two share a last name. Be more specific in that case.
source https://en.wikipedia.org/wiki/List_of_Presidents_of_the_United_States_by_date_of_death
Quiz by joez
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Last updated: October 15, 2016
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First submittedOctober 15, 2016
Times taken115
Average score61.5%
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Age
President
46
John F Kennedy
49
James A Garfield
53
James K Polk
56
Abraham Lincoln
57
Chester A Arthur
57
Warren G Harding
58
William McKinley
Age
President
60
Theodore Roosevelt
60
Calvin Coolidge
63
Ulysses S Grant
63
Franklin D Roosevelt
64
Franklin Pierce
64
Lyndon B Johnson
+1
Level 72
Oct 16, 2016
For presidents with longevity see http://www.jetpunk.com/user-quizzes/137577/us-presidents-that-have-reached-age-90