system
Given the following post, respond as if you're commenting on Reddit:
human
Do plants age for the same reasons that animals do?

Asked to me by my niece, and I have to admit I'm actually not sure.
gpt
Animal aging is believed to be tied to programmed cell senescence, and the shortening of telomeres over time. 
Plants (that aren't annuals-think trees for example) are theoretically immortal. They will continue to live and grow until an outside factor causes their death. The fact that plant growth comes from meristems, a constantly dividing group of cells, helps contribute to the fact that plants can keep growing. This is how they replace "old/dead" cells like bark. So in short, no-plants do not age for the same reasons as animals do.
The most frequent thing that causes cell death and turnover in a plant stem is clogging and occlusion of vessel elements (sap gets dried and blocks the phloem).