If you put plenty of hours on your kites, they are well at the end of there life at three years old. Stretched lines/canopy/material soft/worn-out bar etc.
If you kite once a month, they are probably good for another few years.
The Reo's are great wave kites; have been since the first release in 2011.
Each year they get better and better, but of coarse these are refinements.
Nothing beats the crisp-ness of fresh kites...