GORE-TEX fabric will last for many years. It's incredibly durable, and unlike other "waterproof/breathable" fabrics that can lose waterproofness after repeated laundering, flexing, abrasion, exposure to body oils or insect spray, the waterproofness and breathability of GORE-TEX fabric is guaranteed under any conditions you may encounter.
Please note: This refers to items that have been treated and washed in accordance with care instructions.