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Kokichi Mikimoto was born on January 25, 1858 and died on September 21, 1954. Kokichi Mikimoto would have been 96 years old at the time of death or 154 years old today.
Depends where it is in the sentence. "The birthday girl and I are going to eat cake." "Give the cake to the birthday girl and me." If it helps with compound subjects or nouns like this, imagine...