Testing drugs in humans with lifespan as an endpoint is prohibitively slow and expensive, making mice an ideal animal model for such tests.

“testing a drug in humans with lifespan as an endpoint is almost hopelessly slow and almost hopelessly expensive the ideal animal for making a test of that is the mouse”

“if you have a drug that extends Mouse lifespan I think that's a critically important step towards making a case that it's slowing aging but it's not the last step”