Summary of my statistics for the maximum number of planets going retrograde simultaneously (5 classical or 7 including Uranus, Neptune and Pluto) for all centuries since the 1st century CE. Only a fraction of a percent of a population will be born with a maximum number of retrograde planets (few days in 1940s and 1984 in entire 20th century). See main article: Retrograde Planets and their Number in the Natal Chart