That helmet is now a threat to all humanity and should be destroyed immedately, primarily because of the color issue. I doubt that "bouncing down the stair" incident has significantly damaged the protection vlaue or that age has a significant impact either. I have heard that 2 years is a minimun lifespan of a helmet and that manufacturers encourage you to replace at that time . After that it's up to you to judge condition, degree of usage and care, etc. I unfortunately have never had a helmet survive more than a year because of a periodic "crashing" problem. Was glad to replace the fractured remains of my primary safety system each time.