Coffee linked to slower biological ageing among those with severe mental illness

Should people be unequally denied caffeinenated coffee on the basis of medical status as determined by a physician they must pay?

What about decaf only; 0.3% coffee?

Is decaf linked to slower biological aging, too?

Coffee contains a bunch of healthy compounds. Quercetin for one. A bunch of other flavonoids.

Coffee, the brew, is not a significant source of Quercetin. The grounds, the part you throw away, may be. But capers are like ~200mg per 100g, and outpaces all the other common sources of it, so if you were really big on Quercetin, you'd be looking at anything but coffee.