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At 85, he's silver haired and cerebral and says he simply can't keep up. pope benedict xvi told his cardinals he had become so infirm, "i've had to recognize my incapacity to adequately fulfill the ministry entrusted to me." in the last year, benedict grew increasingly frail. >> he certainly slowed down a bit. you can tell he had trouble negotiating steps. he started using the cane several months ago. >> reporter: but the german pope never slowed down. putting the church on an orthodox path. he opposed homosexuality and female priests. he tried to heal wounds, apologizing to victims of sexual ...

>> reporter: good morning, rob. good morning, diana. pope benedict is a shy leader but a reminder of the man they used to call god's rottweiller. unpredictability, unprecedented and it might just guarantee his legacy. at 85, he's silver haired and cerebral and says he simply can't keep up. pope benedict xvi told his cardinals he had become so infirm, "i've had to recognize my incapacity to adequately fulfill the ministry entrusted to me." in the last year, benedict grew increasingly frail. >> he certainly slowed down a bit. you can tell he had trouble negotiating steps. he started using the ca...

Catholic church. pope benedict will step down at the end of the month. >> catholics are waiting to see who will be chosen to replace him. abc's nick schifrin is joining us from vatican city. >> reporter: pope benedict is a shy leader but a reminder of the man who they used to call god's rottweiller. unpredictable, unprecedented. it just might guarantee his legacy. at 85, he's silver haired and cerebral and says he can't keep up. pope benedict xvi said he's become so infirmed, "i've had to recognize my incapacity to adequately fulfill the ministry entrusted to me." in the last year, he grew inc...