Just off the top of my head, I think the longest they ever got a mouse to live in a study was the C-60 study where they wanted to test whether it was toxic and the mouse lived almost twice their normal lifespan. This paper has been cited over 300 times, so it's not like people haven't taken notice of it. There are a few supplement companies selling c-60 olive oil too:
https://www.sciencedirect.com/science/article/abs/pii/S01429... "Here we show that oral administration of C60 dissolved in olive oil (0.8 mg/ml) at reiterated doses (1.7 mg/kg of body weight) to rats not only does not entail chronic toxicity but it almost doubles their lifespan"
Most deaths seem to be cardiovascular, heart disease, stroke, then followed by cancer.
Oh, that's just derived from old theology.
Genesis 6:3, 'Then the LORD said, “My Spirit will not contend with humans forever, for they are mortal; their days will be a hundred and twenty years.”'
This kinda got spread throughout the zeitgeist long ago as a "maximal lifespan", but the reality is that only 3 in 10,000 even make it to 100. There's no hard cutoff, but functionally essentially no one gets to 110.
Scientifically, there's no hard reason we couldn't increase our lifespans indefinitely, but we've got a lot of work to do before we'll be able to get a reasonable number of people up to 125.
2. The most common causes of death for wild mice are predation, diseases, and starvation. Theoretically immortal mice have no chance in the real world if not very well-adapted to these conditions.
[1] https://biologyinsights.com/the-mice-mating-process-and-thei...
Fascinating, really.