In a sense, they can live indefinitely or forever (as long as conditions are favorable).
Because of the way they grow, each leaf is essentially an independent plant that can form its own root system and which typically shares some connective tissue underground with other, older leaves. As those older leaves die new ones are produced, and if the plant is healthy this cycle can occur continuously for as long as conditions permit.
In addition, Venus Flytraps clone themselves by dividing and forming smaller plants (smaller growing crowns and rosettes) around the central parent plant. A clone is a genetic replica of the original plant, and hence the same plant. I grow a clone that’s been around since 1955. It’s the oldest clone I know of in cultivation.