That also started me thinking about my earliest memories of a president and I think it was Lyndon B. Johnson, our 36th president. I vaguely remember watching him on TV addressing the nation about the Vietnam war. I don't remember Kennedy or Eisenhower at all. Nixon was a powerful presence because he served during my middle school years and because Watergate and his attempts to finally end the war in Vietnam were daily national stories. In fact, I vividly remember Nixon's attempts to end the Vietnam war because of the direct impact it would have as I neared draft age.
Anyway, here are the list of presidents in my lifetime, in order:
Dwight D. Eisenhower - 34th
John F. Kennedy - 35th
Lyndon B. Johnson - 36th
Richard Nixon - 37th
Gerald Ford - 38th
Jimmy Carter - 39th
Ronald Reagan - 40th
George H. W. Bush - 41st
Bill Clinton - 42nd
George W. Bush - 43rd
Barack Obama - 44th
Donald Trump - 45th
Joe Biden - 46th
You can do your own calculation HERE.