Declension table of ?yauvanastha

Masculine	Singular	Dual	Plural
Nominative	yauvanasthaḥ	yauvanasthau	yauvanasthāḥ
Vocative	yauvanastha	yauvanasthau	yauvanasthāḥ
Accusative	yauvanastham	yauvanasthau	yauvanasthān
Instrumental	yauvanasthena	yauvanasthābhyām	yauvanasthaiḥ yauvanasthebhiḥ
Dative	yauvanasthāya	yauvanasthābhyām	yauvanasthebhyaḥ
Ablative	yauvanasthāt	yauvanasthābhyām	yauvanasthebhyaḥ
Genitive	yauvanasthasya	yauvanasthayoḥ	yauvanasthānām
Locative	yauvanasthe	yauvanasthayoḥ	yauvanastheṣu

Compound yauvanastha -

Adverb -yauvanastham -yauvanasthāt