By Joshua McElwee VATICAN CITY, Oct 14 (Reuters) – When US Cardinal Robert Prevost emerged on the balcony of St. Peter’s Basilica in May 2025 as Pope Leo XIV, the new leader of the Catholic Church, he struck a stark contrast from his predecessor Francis. Leo, young for a pope at 69, appeared energetic, spoke in a strong voice and had no known history of health issues. Francis, who died at 88, had become increasingly frail during his 12-year pap…