To express the exact degree of difference in a comparison (like being five years older or two kilos heavier), use the preposition za followed by the Accusative case.
| by (degree of difference) | za |
| My son is five years older. | Moj sin je stariji za pet godina. |
| His daughter is two months younger. | Njegova kći je mlađa za dva mjeseca. |
This structure works seamlessly for physical measurements using comparative adjectives like viši (taller) and teži (heavier).
| The boy is seven centimeters taller. | Dječak je viši za sedam centimetara. |
| The pediatrician says that the baby is one kilogram heavier. | Pedijatar kaže da je beba teža za jedan kilogram. |
The preposition za also pairs directly with verbs indicating a change in size or measurement, such as porasti (to grow taller) or prerasti (to outgrow).
| Will he grow ten centimeters in puberty? | Hoće li u pubertetu porasti za deset centimetara? |
| In puberty, the boy outgrew his mother by a head. | U pubertetu je dječak prerastao majku za jednu glavu. |
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