Declension table of ?vayasyakatva

Neuter	Singular	Dual	Plural
Nominative	vayasyakatvam	vayasyakatve	vayasyakatvāni
Vocative	vayasyakatva	vayasyakatve	vayasyakatvāni
Accusative	vayasyakatvam	vayasyakatve	vayasyakatvāni
Instrumental	vayasyakatvena	vayasyakatvābhyām	vayasyakatvaiḥ
Dative	vayasyakatvāya	vayasyakatvābhyām	vayasyakatvebhyaḥ
Ablative	vayasyakatvāt	vayasyakatvābhyām	vayasyakatvebhyaḥ
Genitive	vayasyakatvasya	vayasyakatvayoḥ	vayasyakatvānām
Locative	vayasyakatve	vayasyakatvayoḥ	vayasyakatveṣu

Compound vayasyakatva -

Adverb -vayasyakatvam -vayasyakatvāt