I think chronic pain is described as anything over 12 months; but more so dealing with it for years or decades (sometimes a person's entire life) tends to wear

I think chronic pain is described as anything over 12 months; but more so dealing with it for years or decades (sometimes a person's entire life) tends to wear you down quite a bit, especially when this is accompanied by a reduction in mobility, motor skills, etc. (Although personally I think while mental health is a large component of chronic pain management I'd say the pain management itself is still the primary issue at hand)