Source:http://linkedlifedata.com/resource/umls/id/C1159867
GO: A developmental process that arises as the cell progresses toward the end of its lifespan and cause changes cellular metabolism, resulting in a decline in cell function; for example, one aspect of general metabolic decline is a decrease in the efficiency of protein synthesis. [GOC:jh, GOC:mah, PMID:9891807]