The length of time for which an organism lives.
Some clams have lifespans far longer than those of human beings.
The length of time for which something exists or is current or valid.
Old age; accumulated damage to macromolecules, cells, tissues and organs with the passage of time.
The state or process of ageing, especially in humans; old age.
Fruit senescence, leading to ripening of fruit.
Ceasing to divide by mitosis because of shortening of telomeres or excessive DNA damage.
Condition when the cell ceases to divide.