Number of hours can be misleading.
My friends 180 was the best ever, 9,000 hours. He had owned it for 50+ years, sold for 55k. It was a photo plane, as in doing 10,000' altitude transects for hours at a time. Light loads and few cycles nice VFR. Did not get beat up with heavy loads on short strips it's entire life, and did not have a float kit.
The 185 I am flying has 15,000 hours on it, (new wings this year), and we fly it every day into salt and some rough water. Big tires and floats put more wear on the plane.
The thing to watch for is loose rivet joints and gear box. Having someone pull and push the lift struts while you watch the underside between the gear legs, and inside the gear box can tell you quite a bit about the wear. Also, look at the size of rivets, and if they have been sucked down and pulled the aluminum into a dimple... indicators of wear.
After a while the aluminum skins will have elongated holes in the seams. The only way to tell is by seeing vibration dust tracks, or watch it move. All the gear box wear can be replaced/repaired, just costs money. Same with wings.
But again, I can put as much wear on a bird in 2,000 hours as some birds get in 10,000 just from float and off airport work. So ask how it has been used.