By Ray Sanchez, South Florida Sun-Sentinel Dec. 18--HAVANA -- In one of the clearest signals that Fidel Castro might give up his formal leadership posts, the ailing head of state said in a letter read on television Monday that he will not cling to power forever.

Ailing leader Fidel Castro said in a letter read on state television Monday that he does not intend to cling to power forever or stand in the way of a younger generation, but invoked the example of a renowned Brazilian architect who is still working at 100.

Ailing leader Fidel Castro said in a letter read on state television Monday that he does not intend to cling to power forever or stand in the way of a younger generation, but invoked the example of a renowned Brazilian architect who is still working at 100.