Senescent (adjective)

1. Relating to old age.
2. Relating to the process of aging.
3. Relating to the decline in function and vitality associated with aging.

Origin:

The word is derived from the latin word "senescens" which means growing old.

Examples:

1. Senescent cells are cells that are no longer able to divide and are considered to be in the final stages of growth.
2. A senescent organism is an organism that is in the final stages of its life cycle.
3. The senescent brain is characterized by a decline in cognitive functions.
4. Senescent cells play a role in aging and age-related diseases.
5. The senescent heart is characterized by a decline in cardiac function.