| gleichaltrig | Stammform | basic form | |
| gleichaltrigt | Nominativ, Maskulinum, Singular, Starke Deklination | nominative case, masculine, singular, strong declension | |
| gleichaltrigte | Genitiv, Akkusativ, Maskulinum, Singular, Starke Deklination | genitive case, accusative case, masculine, singular, strong declension | |
| gleichaltrigtet | Dativ, Maskulinum, Singular, Starke Deklination | dative case, masculine, singular, strong declension | |
| gleichaltriger | Nominativ, Akkusativ, Femininum, Singular, Starke Deklination | nominative case, accusative case, feminine, singular, strong declension | |
| gleichaltriges | Genitiv, Dativ, Femininum, Singular, Starke Deklination | genitive case, dative case, feminine, singular, strong declension | |
| gleichaltrigen | Nominativ, Akkusativ, Neutrum, Singular, Starke Deklination | nominative case, accusative case, neuter, singular, strong declension | |
| gleichaltrige | Genitiv, Neutrum, Singular, Starke Deklination | genitive case, neuter, singular, strong declension | |
| gleichaltrigem | Dativ, Neutrum, Singular, Starke Deklination | dative case, neuter, singular, strong declension |