As Castro Fades, a Crop of New Cuban Leaders ; Interviews with Two Younger Political Figures Suggest a Gradual Opening Both Economically and Socially

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In a country that is in the process of bidding a long farewell to its ageing revolutionaries, Mariela Castro brings an expectation of change along with an air of youthful passion. As the director of Cenesex (the National Sex Education Center) Ms. Castro is eager to consider where Cuba should go in a postrevolutionary era.

"We have many contradictions in Cuba," says Castro, the daughter of Raul Castro, Cuba's de facto leader and brother of ailing President Fidel Castro. A Spanish doctor arrived in Cuba last week, reenergizing speculation about the health of the Cuban leader, who has not been seen in public since undergoing surgery in July. "We need to experiment and to …