That house over there is the biggest. When referring to age, use the irregular forms mayor and menor . Juan is younger than Maria. Maria is the oldest of the family. El agua es de mayor importancia de la comida.
Water is more important than food.
La comida es de menor importancia del agua. Food is less important than water. The words joven and viejo are used for non-comparative descriptions of age. The boy is young. El abuelo es viejo.