No rush to photograph that gorgeous marine flatworm... it'll look that good forever!
Thanks to Gizmodo for sharing the Why's and Wherefore's of the Great Flatworm Mystery: Immortality... and eternal youth (aka "negligible senescence".)
All the info is HERE.
In a DNA-sized nutshell: key parts of the flatworms DNA doesn't "fray" during cell division.
It's the normal fraying of the strand ends, or teleomeres, that results in poor copying as the years pass.
Bad DNA copying = aging, wrinkles, joint pain, presbyopia....the whole Not-For-Sissies complex:
Flatworms, however, make perfect copies forever, repairing their own DNA strands while they repair and replace anything that gets damaged.
Gorgeous forever....or until eaten.
The Twinkie Scenario.
So next time you see marine flatworms, show a little respect for your perfect elders.