Pope Benedict XVI delivers his blessing during his final general audience in St Peter's Square, on February 27, 2013 in Vatican City, Vatican.
Photographer: (Photo by Franco Origlia/Getty Images)
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CASTEL GANDOLFO, Italy - Retired Pope Benedict XVI has spent his 86th birthday behind closed doors at the papal retreat south of Rome amid concerns for his health and prayers from his successor.
Pope Francis called Benedict to wish him well and offered up his Tuesday morning Mass in his honor, praying that "May God be with him, comfort him and give him much solace."
Benedict appeared frail and weak on March 23 -- the last time he was seen in public -- when he greeted Francis at Castel Gandolfo, a remarkable decline from just three weeks earlier.
The Vatican has denied he is suffering from any illness, but insists he is simply old and tired.
Before he left the Vatican, Pope Benedict said that in retirement he would remain "hidden from the world," and he has kept his word.
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