A couple of years ago I helped a snapping turtle across the road once, near my home. He was the size of a small coffee table, and some people who came along to watch (not to help, thank you) told me he was probably 75-100 years old.
I pulled over because he was in the road, and at risk of getting run down. He was very angry with me and was snapping all over the place. I had to use my snow brush thing to push him off to the side which was extremely difficult because he weighed a tonne and was fighting me the whole time!
One of the people told me he had probably be displaced from his home because of the harvesting of the farms in the area.
Their necks are very, very long, longer than any other type of turtle I have come in contact with, and they can reach all the way back to the sides of their bodies. Their legs are very strong and he was fighting me all the time, even though I was pushing him in the direction that he was going. They have huge heads and beaks.
They are incredibly beautiful creatures, and I was in awe of that guy being almost a century old. Their legs and necks are like dinosaurs with plates on them. I watched him for a long time after I got him to safety, I was concerned he would turn around and I knew that I probably wouldn't see another one at such close range again. He slowly disappeared into the tall grass.
Just be extremely careful if you ever come across one, they are dangerous and have a huge amount of attitude. They can easily take all your fingers and toes off if you aren't careful - especially the full grown ones.