Noun
The state of growing old; decay by time.
Source: Webster's dictionaryThe general rule is that anything that is passed on in reproduction does not undergo senescence. George C. Williams
We've spent the last few millennia aware that senescence is horrible but knowing nevertheless that it's inevitable. We've had to find some mechanism to put it out of our minds so we can get on with our miserably short lives. Aubrey de Grey
Senescence begins And middle age ends, The day your descendents, Outnumber your friends. Ogden Nash
Patriotic and tribal feelings belong to the squalling childhood of the human race, and become no more charming in their senescence. They are particularly unattractive when evinced by a superpower. Christopher Hitchens
Cellular senescence occurs in response to DNA damage or degradation that would make a cell's progeny nonviable; for example, become cancerous. Source: Internet
Gradual senescence is exhibited by all placental mammalian life histories. Source: Internet