User blog comment:Panz Fry/The last Shichibukai/@comment-4899461-20130227135300/@comment-3425840-20130227152255

JSD, Z's arm was cut 22 years after the murder of his loved ones. The murder took place after a year of him becoming an Admiral. He became an Admiral at 38 years age, so when his arm was cut off, he was 38+1+22=61 years old, when he fought Luffy he was 74, thus it implies that his arm was cut off 13 years ago not 45 years.