> They started by taking fecal samples from 3- to 4-month-old mice—young adult mice, by human standards—and fed the slurry to geriatric 20-month-old rodents usi

> They started by taking fecal samples from 3- to 4-month-old mice—young adult mice, by human standards—and fed the slurry to geriatric 20-month-old rodents using a feeding tube twice a week. How similar is the brain aging in a 20 month old mouse to the brain aging in a 70/80/90 year old human? I think one of the biggest errors when looking at animal aging studies is assuming thinking that there is a linear relationship (for example 1 human year is 7 dog years, etc).