This is the 279th most frequent Icelandic word.
eldri
"Older."
The word 'eldri' is used as a comparative adjective, comparing the age of the speaker to that of their brother.
Ég er eldri en bróðir minn.
I am older than my brother.
Here, 'eldri' functions as an attributive adjective describing the noun 'part' related to the city.
Hún lifir í eldri hluta borgarinnar.
She lives in the older part of the city.
In this example, 'eldri' modifies the noun 'hlutir' to indicate that the objects are older in age.