Is a good life the greatest achievement? Jimmy Carter was not America's leader for very long. But some say it is what he did afterwards that really matters.
Lessons from a 100-year-old president
Centenarian: Jimmy Carter was born in 1924, the same year that Denmark claimed Greenland and the first crossword puzzle was published. Glossary
Jimmy Carter - The US president from 1977 to 1981. He was a Democrat.
President - In some countries, the leader is called the president.
USA - The United States of America is a country in North America. It has a population of 329 million.
Moral - Concerned with what is right and wrong.
Criticise - Find faults with something.
Ronald Reagan - Originally an American actor and politician, Reagan became the 40th President of the United States serving from 1981 to 1989.
Charities - Organisations that helps people in need. They do not make money as a business does. Most people who work for charities are volunteers. This means they are not paid.
Courage - Bravery. Strength in the face of difficult situations.