it's about comfort, use one on my '05 RKC at first on longer rides - now anytime I'm on, it's on
helps a lot to keep your posture good for control as well as easin' the strain on the old back
Here is my answer to your question....... 20 years old... YES: 30 years old...Yes: 40 years old...NO: 50 and over... You are not very bright if you DON'T have one..... Just my 02........hdman