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Algernon Blackwood was born on March 14, 1869 and died on December 10, 1951. Algernon Blackwood would have been 82 years old at the time of death or 143 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...