Musk turtles usually live 30 to 40 years, but there are cases when a musk turtle can end up living more than 50 years.

In their natural habitat, the young ones face different problems. Mud Turtle Facts and Care Sheet. They are called mud turtle as they prefer to live in wet muddy areas such as temporary ponds. Even small species that are typically kept as pets, like box turtles and terrapins, live between 30 and 40 years if they're kept healthy. Aquatic turtles are fun pets to own and watch, but not everyone has room for the large enclosures that bigger water turtles, like red-eared sliders, require. Turtles are a surprisingly diverse group of animals, with 55 species occurring naturally in the United States. These turtles are small and omnivorous. Unfortunately, many pet turtles don’t live that long in captivity because they don’t receive proper care.. How long do musk turtles live?
Where a turtle lives in the wild depends on the species, as different species have different habitat requirements. Musk turtles live a very long time compared to other animals, so let’s see exactly how long they live. Turtles and tortoises are some of the most long-lived members of the reptile family. As you can see the amount of time a musk turtle will live is not very well defined. Larger species such as sea turtles are estimated to live about 80 years.

I read that the water depth for an adult should be about 6"-8" and a baby/hatchling should be about 1"-2." Thankfully there are smaller water turtles like the Mississippi map turtle that don't require such large habitats. Generally kept as pets, mud turtles are easy to care for.
So if I plan to keep a mud turtle in a 55 gal tank (4 foot long) for its whole life, how much of the tank should be land and how much should be water (for an adult). How long do red-eared slider turtles live in the wild?. Factors such as diverse diet, proper filtration, and temperature are the most important.