As this question was asked and answered in July 2014, the answer is Ronald Reagan.
Reagan
There was no US President 350 years ago (1663). The United States of America was formed in 1776.
The United States is only 231 years old.
William Jefferson Clinton was president of the United States of America 20 years ago. Clinton was president from 1993 to January 2001.
13 years ago from 2010. The 42nd President of the United States was Bill Clinton from January 20, 1993 to January 20, 2001
12 years ag from 2010. The 42nd President of the United States was Bill Clinton January 20, 1993 January 20, 2001
44 Years ago today (2010) The 38th President of the United States was Gerald Ford from August 9, 1974 to January 20, 1977
180 years ago today (2010) The 7th President of the United States was Andrew Jackson from March 4, 1829 to March 4, 1837.
29 years ago today (2010) The 40th President of the United States was Ronald Reagan from January 20, 1981 to January 20, 1989
100 yeas ago today (2010) The 27th President of the United States was William Howard Taft from March 4, 1909 to March 4, 1913.
No foreigner may be President of the United States. It is specifically mandated that the President of the United States be born in the United States, or to a United States Citizen. The president must also have lived in the United States for at least 14 years. She may not be a U.S Senator until she has lived in the United States (and the state she wishes to represent) for at least 9 years. Nor, may she be a Representative, as they require a 7 year citizenship.
10 years ago today (2010) The 42nd President of the United States was Bill Clinton from January 20, 1993 to January 20, 2001
As of 2017, it's been 57 years since Kennedy's election.