the oldest stadium is Fenway Park
Fenway Park for the Red Sox is the oldest active stadium and the smallest so I believe they were a lot smaller.
Fenway Park
New York Yankees
Boston the Yankees have a brand new stadium
Dodger Stadium is. It has been open since 1962.
Fenway Park
#4 - Angel Stadium of Anaheim (1966)
Mariano Rivera
Wrigley Field is the second oldest Major League baseball park in use today. It opened in 1914. Fenway Park is the oldest opening in 1912. And coming in 3rd is believe it or not Dodger Stadium which opened in 1962.
The oldest NFL stadium currently in use is Soldier Field in Chicago.
The oldest active franchises are the Atlanta Braves and the Chicago Cubs. Both are charter members of the National League which began in 1876.
Behind Yankee Stadium, Fenway Park, and Wrigley Field, I believe it is Dodger Stadium. I have looked up this question before and have found different answers but majority answered it as Dodger Stadium.