Louise, here is what Kendall Farr has to say, from her book Style Evolution: How to Create Ageless Personal Style in Your 40s and Beyond. (This doesn't apply to youthful you, but thought you'd like to read how she captures the F21 vibe.):
"Forever 21: Young, fast, and shiny. Everything is shiny. Unless you have forged a pact with the devil and will remain Forever 21, this is now a forever no. Even for accessories. Sorry, I know some moms swear by things they find when shopping with their teenagers, but the look is for teens and early twenties and it is unapologetically, flammably cheap."