UV and heat cause premature aging. The aging you cannot help is from mechanical cycling. Basically this is the number of times it cycles through its structural design or is bent from minus x to plus x. For any design you could produce a curve that relates load, cycles per hour and life

Every time you apply a full load cycle to a composite, you get some level of micro delamination. In theory the designer should determine what loads it must handle and what lifetime they want and back out the laminate. This is true for all plastic laminates and aluminum. Steel is different. Carbon and aluminum crack and fall apart. Steel gets flexy. In Engineering this usually lumped under fatigue.

I have never seen a study of the life of a catamaran. There was one published for mtn bikes. A light cross country racing carbon frame was good for about 3 years. Similar aluminum frames ranges from 4-5 years for hydoformed aluminum to ~6 years for welded tubing. Building a general purpose trail frame that is .5 to 1.5 lb heavier extends the life to 10-12 years.

Boats are different from bike frames. With one design boats there is a minimum weight. Newer designs put strength/weight where it is needed and greatly increase life. For example Lightnings and Tornados. Manufacturer one designs, at least to me, seem to have good years and bad years depending on how accurate the venders claims for their resin, fabric, core material etc was. With formula boats it's mixed, though the best built ones seem to live long enough to become obsolete. Because you have a volume production boat used for the Olympics there is some data available for Lasers. I seem to remember 5 years weekend warrior is equal to 6 months for an Olympic hopeful.

This is about as much as I know. Don't bother to ask me anymore. This is a area where I have to go ask experts and there are not many of them.