There is no cut off date for buckets. Its about the condition of the lift, if it can pass inspection every year, then you are good to go. My brother run's a 1972 65' sky worker that my dad use to own, the bucket had been reconditioned and mounted on a 2004 F-750. Its a great unit, elevator and pretty compact, great for back yard tree removals. To him it was worth the investment to recondition the unit and mount it on a new truck. Bottom line is its not the age of the lift, its the condition and maintenance records of the lift.