It doesn’t look a day over 107!

The city’s subway system opened 108 years ago today with a single line that connected City Hall to Harlem, a history-making event that helped spur New York’s massive growth throughout the 20th century.

The Interborough Rapid Transit train — which was privately owned — ran beneath Park Avenue South to Grand Central, across 42nd Street to Times Square and then up Broadway to 145th Street.

The first train — with ads touting 12-cent cans of Campbell’s soup — was helmed by then-Mayor George McClellan Jr.

jennifer.fermino@nypost.com