mladém
mladém is the locative singular masculine form of the Czech adjective mladý, meaning "young." It is not a stand-alone noun but a grammatical form used in constructions requiring the locative case, most often with the preposition v meaning "in" or "at."
Origin and grammar: The adjective mladý derives from Proto-Slavic *mladъ, related to words for youth across Slavic
Usage and examples: The form appears mainly in phrases describing age or youth. The most common collocation