Future top leaders of Cuba's Communist party should retire at 70 to let in younger blood President Raul Castro said on Saturday suggesting older members of the party  hoping for promotion to the top table could play with their grandchildren instead Raul Castro himself is 84 and after his planned retirement from government in two years time the country is likely to be led by somebody with a different surname for the first time since his brother overthrew a pro-U.S. government nearly 60 years ago