Is there a definition of "perfect health" in the QALY framework? One year of life in twenty year old body is probably better than in one that is sixty, for exam

Is there a definition of "perfect health" in the QALY framework? One year of life in twenty year old body is probably better than in one that is sixty, for example. I ask because at some point we could be asked to consider treatments that could take the "perfect health" score above 1.0. I'd argue that people who do potentially dangerous things like taking steroids already do something like this, valuing a "1.1" year of health now over a potential number of "0.5" years later.