LOS ANGELES (AP) — It took more than 60 years but a University of Southern California student has finally received his diploma.

Ninety-six-year-old Alfonso Gonzales received a bachelor of science degree in zoology on Friday, making him the oldest graduate in USC history.

The World War II veteran thought he'd already graduated when he skipped commencement exercises in 1953 because of work obligations. He was founding a soil company that he ran for 55 years.

But when relatives recently approached the university about getting a copy of his diploma, they learned he was one unit short.

Although the school no longer offers a zoology major, it crafted an independent study course through the gerontology school that included reading, video assignments, visiting other classes, and writing a thesis about his life.

USC officials call Gonzales a "wonderful inspiration."