Getting rid of a disease ?

[ano]

As an addendum, sometimes you can cure an old age affliction by making them not old. I think.

Ie., if they are old, and get afflicted, and you then empower in nature they can then be cured.

"Old age afflictions" are very simple. There're no "old age afflictions" and "not old age afflictions". Any affliction can be cured if a unit is not old (and not undead etc.) and no affliction can be cured if a unit is old. Making him not old will obviously allow you healing his affliction and it's not "sometimes". I've done a lot of tests once and was really surprised by the simplicity of this mechanics. Affliction objects don't have "old age" tag or something, it's a unit object what has this property.
Chalice and GoH heal independently of old age.