Most life cycles we knew of consist of a juvenile stage (e.g. larval for insects, sporozoite for some intracellular parasites), a reproductive stage and an adult stage. Usually the reproductive stage occur when the organism reached the adult stage.
But are their examples of organisms where its natural life cycle involve reproduction at an early stage, and then the parent then went through more distinctive stages after the reproductive stage and then dies off? For example:
The closest thing I can think of is the life cycle of mayflies, which dies a short period after the mating stage. But mayflies has only one adult stage thus it is does not really answer the question