I can't be that old

While waiting for my first appointment in the reception room of a new dentist, I noticed his certificate, which bore his full name. Suddenly, I remembered that a tall, handsome boy with the same name had been in my high school class some 30 years ago.

Upon seeing him, however, I quickly discarded any such thoughts. This balding, gray-haired man with the deeply lined face was way too old to have been my classmate.

After he had examined my teeth, I asked him if he had attended West Catholic High School.

"Yes", he replied.

"When did you graduate?" I asked.

He answered,"In 1956. Why?"

"You were in my class!" I exclaimed.

He looked at me closely and then asked, "What did you teach?"