There are at least 3 artists with this name.
1) Forever Young is a vegan straight-edge band from Umeå in Sweden. Legendary city Umeå, which is hatchery of best european hardcore bands. Nowadays the scene isn't so strong as it was in the 90's, bu the bands as Forever Young are inheritor of heritage, which the bands like Refused, Abhinanda, Shield or Purusam left there. FY isn't only straightforward thinking and attitude but also action: they participate animal rights and feministic fests and demonstrations.
2) Forever Young is also a electro-pop band from France.
3) Forever Young are also a pop-punk band from St. Louis. Influenced by bands like Saves The Day.