The phrase "are forever associated" is correct and usable in written English.
It can be used to indicate a lasting connection or relationship between two or more things, often in a cultural or historical context.
Example: "The city and its famous landmark are forever associated in the minds of tourists."
Alternatives: "are eternally linked" or "are permanently connected".
Some performers are forever associated with one production, so that you never expect to see them in any other context or even on the street.
Buckminster "Bucky" Fuller, who created the Montreal Biosphère in 1967, was the foremost pioneer of geodesic domes, the master of tensegrity – tensile integrity – and the reason why geodesic structures are forever associated with eco living.
Boulevard du Temple, 3rd and 11th arrondissements The melody and the words may have been written in 1938, but they are forever associated with Gene Kelly and Leslie Caron, improvising a pas-de-deux by the Seine underneath the Pont Neuf.
The lyrics and imagery created by the band's lead singer, Morrissey, are forever associated with the Manchester of mid-1980s post-industrial dentrenchedenched with accounts of stabbings, domestic violence and back-alley encounters in a city struggling to find new purpose following the demise of its textile and other traditional industries.
His rebellious "yahoo" cry in the title song became iconic and was forever associated with him.
These intrepid names will be forever associated with the location, like a space-bound Christopher Columbus.
Ronald Reagan was forever associated with the small-town virtues of Dixon and Jimmy Carter with Plains.
And that is the crowd with which our daughter will be forever associated.
The pro-life cause will be forever associated with moral hypocrisy on an epic scale.
Ferrero Rocher chocolates had been created a year earlier, to be forever associated with ambassadors' parties thanks to TV adverts.
