Murphy et al. (1988) found that, when the effect of physical illness was controlled, depressed elderly patients (particularly men) had a significantly higher four-year mortality, suggesting that the greater mortality in the depressed group was not due to differences of pre-depression physical health alone.
Source: wiktionary
A child who has dysthymia, or chronic mild depression, captured in the persistent depressive disorder diagnosis in DSM-5, a milder but more chronic set of symptoms over a period of at least 12 months, may not have the cognitive-developmental awareness that their depressive symptoms are different from the emotions of other children, or even their own pre-depression life.
Source: wiktionary
When recovering or recovered from depression, as the sources I consider highlight, some people seem to have a heightened appreciation of beauty, both when compared to when they were depressed, and also when compared to their pre-depression state.
Source: wiktionary