Twenty-one U.S. bishops could retire for age reasons in 2011

Five U.S. cardinals and 16 other U.S. bishops could retire because of age this year.

There are 12 active U.S. bishops, including three cardinals, who have already turned 75.  Two cardinals and seven other bishops will celebrate their 75th birthday in 2011.

At age 75, bishops are requested to submit their resignation to the pope.

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