Fleetwood Mac are a British-American rock band, formed in London in 1967. The band have sold more than 100 million records worldwide, making them one of the world's best-selling bands of all time. In 1998, selected members of Fleetwood Mac were inducted into the Rock and Roll Hall of Fame, and received the Brit Award for Outstanding Contribution to Music.
Fleetwood Mac was formed 52 years ago. 
According to the context, Fleetwood Mac was formed in 1967. The year is now 2019, so that would make 52 years since the formation of the group. 