No, George Carlin did not attend college. He graduated from the United States Air Force Academy in 1959 and went on to become a fighter pilot. George Carlin was about 23 years old when he first performed stand-up comedy. This was in 1965 at a club called The Punchline in San Francisco, California.
It is interesting to note that during this time period, there were very few comedians performing stand-up comedy. So, it is no surprise that George Carlin would be considered one of the most influential comedians of all time and receive the Lifetime Achievement Award from the Kennedy Center for his contributions to American culture.