- The trick would be to have just enough enzyme in your bloodstream to replace senescent cells as they are about to the, but not so much that healthy cells are replaced. - "Syndrome", Thomas Hoover.
- The experiences which voice themselves in theology have cooled and hardened down; the philosophy which is implicit in theology is past philosophy; the science implicit in theology is senescent science. - "Modern Religious Cults and Movements", Gaius Glenn Atkins.
- A senescent city; mostly antiquated Spanish architecture,- ponderous archways and earthquake- proof walls. - "Two Years in the French West Indies", Lafcadio Hearn.