Conversation so far:
where did mcdonald's open their first restaurant?
the first McDonalds was opened by Richard and Maurice McDonald in San Bernardino, California in 1940
is the first McDonald's restaurant still open?
The San Bernardino store was demolished in 1976
who was the first McDonald's restaurant cook?
Richard McDonald

Question: where is the oldest still operating?
Self-contained rewrite: where is the oldest still operating McDonald's restuarant?