Life Span of a Boat
Looking at 1960 through 1970's photos of Marinas around the world show large sailing and motor yachts. These were large yachts of 50 feet or more. If you look at a recent picture of these same marinas all the boats have been replaced with much newer yachts.
What is the life span of a yacht? Where did the yachts go? Were they cut up and landfilled?