| Sg | Pl | |
| Nom | aldr | aldrar (rule) |
| Acc | aldr (rule) | aldra (rule) |
| Dat | aldri (rule) | öldrum (rule) |
| Gen | aldrs (rule) | aldra (rule) |
| Sg | Pl | |
| Nom | aldrinn (rule) | aldrarnir (rule) |
| Acc | aldrinn (rule) | aldrana (rule) |
| Dat | aldrinum (rule) | öldrunum (rule) |
| Gen | aldrsins (rule) | aldranna (rule) |