We found one dictionary that defines the word oldishness:

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1. oldishness: Wiktionary

Definitions from Wiktionary (oldishness) ▸ noun:  The quality of being oldish. ▸ Words similar to oldishness ▸ Usage examples for oldishness ▸ Idioms related to oldishness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing oldishness ▸ Words that often appear near oldishness ▸ Rhymes of oldishness ▸ Invented words related to oldishness