Well, in order to be surprised in the first place...
your 16 great-great-great grandfathers
had to meet
your 16 great-great-great grandmothers,
marry and procreate an offspring. If you are about sixty,
it happened sometime about year 1790.
What were their names? Where did they live? How many other children did they have?
By the way, the same year is marked as the year Joseph II, who invalidated serfdom on Czech grounds nine years prior, passed away. Moreover, George Washington, the first president of USA had already been in his position eight months while the King of France, Louis XVI, had two years left to his beheading by guillotine on the Paris Place de la Révolution.