Depending on the plastic, most drivers will last for years if you play regularly. Hitting trees (and maybe even baskets) adds scratches and dents to your discs. This is called “beating in” the disc, and while it can shorten the lifespan of the disc, it can also change its flight for the better. A beaten-in disc is generally easier to turn over, which can be desirable. If a driver has serious dents in the rim, it might start to perform poorly.