Several sources give June 16, 1829, as Geronimo’s date of birth. It’s not clear to NewMexiKen that the Apaches were using the Gregorian calendar at that time. And, indeed, one of those sources, The New York Times, stated in its obituary of Geronimo in February 1909 that he was nearly 90 — not 79 as this birth date would indicate. But, he had to be born some time. So why not June 16?