GORE-TEX membranes come guaranteed to remain waterproof for their usable lifetime when given proper care. By waterproof, GORE-TEX means no water from the outside will penetrate to the inside.
Proper care means washing your waterproof garments regularly and following the manufacturers’ washing instructions. Doing so preserves the outer DWR coating. The DWR coating reduces the fabric’s surface tension. This causes water to simply roll off.
Get more intel on how to DWR coating on waterproof jackets here.