Qualitative differences have been found between senescent cells and normal cells, including differential expression of cytokines and other factors associated with inflammation.
Emergence of a new cohort follows approximately 2 weeks after oviposition, and senescent snails (i.e., those approximately 374 days old) die shortly after reproduction.
There is a lack of substantial telomerase activity in some cell types such as primary human fibroblasts, which become senescent after about 3050 population doublings.
A climax stand that is uniformly aged becomes senescent and degrades within a relatively short time-period to result in a new cycle of forest succession.