If people are judging lifespan by not using heaters & then whats the real life span?

For a common snapping turtle, their true life span is 50+ years. In captivity the avg lifespan is 25 years. The reason its lower is because people over feed the turtle & then around the age of 20-25 their liver starts to fail & the animal dies.. I feed my guy once every 2 weeks to allow for a more natural life span.

So whats their real lifespan?