Jerome Robbins died on July 29, 1998 at the age of 79.
Jerome Robbins was born on October 11, 1918.
Jerome Robbins was born on October 11, 1918 and died on July 29, 1998. Jerome Robbins would have been 79 years old at the time of death or 93 years old today.
Both are right. It depends on how people spell their name.