system
Given the following post, respond as if you're commenting on Reddit:
human
Do Mitochondria themselves age? What is the repair mechanism of damaged Mitochondria?

So, I've been looking around and I understand the basics of Mitochondrial fusion and fission with respect to the energetic needs of the host cell and their mitotic cycles. 

However, I couldn't find literature with respect to Mitochondria age (not mitochondrial aging theory, but rather, how long does a single Mitochondrion "live" before becoming too damaged to perform their tasks? Say in longer lived cells, such as the neurons in the brain, do the same Mitochondrion survive through the whole life-cycle of the host cell? What about mitochondria that have been poisoned by electron transport inhibitors such as cyanides? Does the host cell detect that the Mitochondria is defective and thus signal for further Mitochondria replication on those that are still functional? 

Also, if Mitochondria does indeed degrade with age of the host mechanism, why aren't new born babies, who simply inherited their mothers mitochondria, suffered from degraded mitochondria?
gpt
When a mitochondria gets a lot of damaged parts what it will do is fuse with a 2nd mitochondria, the now large mitochondria will send all of its damaged parts to one side, and then it will undergo fission and produce one really healthy mitochondia and one extremely unhealthy mitochondria which gets readily destroyed by the host cell. This process is happening all the time and is really quick to the extant that if you put a molecular marker of some sort in a mitochondria, after an hour you will be able to see that molecular marker in all the mitochondria within the cell.