No century oaks, just century palmettos

I was out today calculating the age of a few of the Saw Palmettos on the preserve, based on a formula I learned recently.

Several of the palmettos I checked were more than 100 years old. That raises other questions. How long to do these plants live? How big can they become?

By the way, the ageing calculation was a revelation to me. I knew I had long=trunked palmettos, but I always ascribed that to the lack of fire. As it turns out, unless the fire is hot enough to kill the palmetto, it regenerates and continues to grow. The fire doesn't affect the measurement at all.

Amazing.