Diabetes causes rupturing of small blood vessels, which has been seen in eyes and feet.
It would follow that the same is happening in the brain and an anti-diabetic medicine would directly improve brain longevity in affected individuals.
*I am not a doctor, but also I can correlate data without bias.
> The results highlighted a significant slowing of aging indicators, notably a roughly 6-year regression in brain aging.
And some people call Alzheimer's type 3 diabetes. So there could be something protective?