In the case of Mexican Pinguicula, they have turned their own fragility into a survival mechanism, a very elegant form of clonal reproduction. I think their nature is individually ephremal, depending not on self longevity and seed production over a long lifetime, but rather on a superior evolved mechanism of clonal reproduction. Genetic recombination via sexuall reproduction may have no real advantage to a stable population adapted to a specific niche. So, what if the sun burns out the apical meristem of a Pinguicula species? The leaf bases, secure to the plant body and often buried in the substrate will fall fall away from the parent body, root, and perpetuate the clone. If the plants wither from heal and lack of moisture, they will draw from the outer leaves first, protecting and nuturing the center apical meristem . It would be of no benefit to the plant to drop its leaves in a bone dry and inhospitable environment.
So if the clone is identical to the parent, it is the same plant. It matters not if the individual perishes, the genetic material is intact and unaltered. In this sense the plants are indeterminate in life span, much like the pygmy sundews.
In collections the best plan, as Joseph says, is to propagate, propagate, propagate. That's the name of the game for the Mexican species.
I have also noted a tendency in my plants to split when they reach any large size. The biomass remains approximately the same (and in fact over time increases as the individuals grow) but now there are 4 apical meristems: 4 insurance policies. It is a very winning strategy. Consider this when you think about plant size, since the true size of a clonal population is really the size of the individual, as is its age.