Thomas Jefferson is the only founder you list who ought to be associated with the year 1776. The others actually came to prominence in the 1780's. That said, th

Thomas Jefferson is the only founder you list who ought to be associated with the year 1776. The others actually came to prominence in the 1780's. That said, they were still young. To add a few more, Marx was 29 when he wrote the Communist Manifesto and Fidel Castro was 32 he successfully led the Cuban revolution.