From the manufacturers web site.
Construction:GRP sandwich with vinylester resin and balsa and foam core
.Privilege GRP foam sandwich
topsides and deck
incorporate an end grain balsa core.
The standard for any modern catamaran
is that they are solid glass below the water line and foam or balsa above.
Go to multihull-maven.com for quick comparisons between builders.
Where they very is whether they use things like reinforcements of kevlar in their stress points, carbon fiber cross beams and structural elements, etc.
Either way, unless hit by something catastrophic or fire, to answer the thread subject, I don't think they have any limits on how long they last. Considering that our boats are made up of glass and plastic, both of which will last over 1000 years stuck in a landfill, we shouldn't worry
The real issue is what you do with an old boat to get rid of it!