From what I have read, the ultimate cause of delamiantion is voids, weak points in the layup or bond failure (normally to the core). The material flexs around the weak point until it comes apart.

The prevention is in the construction and design. (Or storing it in a dark climate controlled room and never using it.)

What Matt says will slow the process. However, with some rare exceptions, for older Hobies it is more a matter of how long before rather than will they delaminate.