My YBB is 7 years old and the suspension feels the same as the day I bought it. I went ahead and had Moots due a rebuild recently. Not much to wear out on this suspension except the slider. They also will check sag, which is just a spacer the size of a penny. They can check the spring as well and replace if necessary. The frame should be ready soon, I will post to let you know if I notice any difference.