Stock characters are normally one-dimensional flat characters, but sometimes stock personalities are deeply conflicted, rounded characters (e.g. the Hamlet type). Protagonist - The protagonist is the central person in a story, and is often referred to as the story's main character.
The human body appears in designed to live up to 190 years. All the vital organs and tissue regenerate over time. Pancreas regeneration takes 24 hours, the Stomach a week, blood is replaced regularly, and the brain creates new connection.
They didn't. Most people died in their first 2-3 years. One should also note that the biological capacity for life expectancy today is the same as ancient humans: 120 years. That's about the limit of the homo sapiens. That means that there were always people living over 100 years, in ancient, medieval and modern times in every region of the world.