HAVANA (AP) _ In a letter read on state television, Fidel Castro says he does not intend to cling to power forever or stand in the way of a younger generation.
But the ailing leader invoked the example of renowned Brazilian architect Oscar Niemeyer, who is still working at 100.
Castro has not said when, or even if, he will permanently step aside after temporarily ceding his powers to his younger brother Raul 16 months ago.
He has not been seen in public since he made that announcement in July 2006 after undergoing emergency intestinal surgery.
Officially, Castro remains the president of Cuba's Council of State, making him the country's head of government and state. Several times a week he pens essays, many of them on international issues that are carried on state media.