When was old fashion root beer in business?

You're likely thinking of A&W Root Beer, which was founded in 1919 in Lodi, California.

While it's not called "Old Fashioned Root Beer," it's a brand that is well-known for its classic root beer flavor and is often associated with the traditional taste of root beer.

So, A&W Root Beer has been in business since 1919.

If you're referring to a specific brand of root beer, please let me know the name, and I can provide more information about its history.