S. Jay Olshansky

You can open up a centenarian's brain, and you'll see some areas that look like that of a 50-year-old or of a 110-year-old. You can have variation in the basic process of aging, called senescence, in different parts of the same body.

American Scientist

Aubrey de Grey

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.

English Author

The evolutionary theory of senescence can be stated as follows: while bodies are not designed to fail, neither are they designed for extended operation.

George C. Williams

The general rule is that anything that is passed on in reproduction does not undergo senescence.

Senescence implies the natural aging process in all living beings, not just humans.

Nature's Cycle

It involves not only aging but also the decline in function that comes with it.

Not Just Age

Often used in scientific or technical contexts, less in everyday language.

Technical Term

Highlights the point in life when an organism stops growing and reproducing.

Reproductive Decline

Senescence is an inevitable, universal biological process affecting all living organisms.

Universal Process

In some contexts, senescence is specifically associated with genetics.

Genetic Factors

 have a different normal set point in in something like a bird so that a bird can live a lot longer and maybe they are set really even differently in animals with no senescence at all but we don't know but what you're talking about here is not extending human lifespan by preventing death so much as extending

Experiments that hint of...

 have a different normal set point in something like a bird, so that a bird can live a lot longer. And maybe they're even set really differently in animals with no senescence at all -- but we don't know. But what you're talking about here is not extending human lifespan