This is the 13934th most frequent Swedish word.
äldste
"Äldste" means "eldest" or "senior" in English.
The word 'äldste' is used in this sentence as a superlative adjective to denote the person with the highest age in a group (the family).
Han är den äldste i familjen.
He is the oldest in the family.
In this context, 'äldste' is employed as a noun, often referring to someone with seniority or authority in a community or group.
De har valt honom till äldste i byrådet.
They have elected him as elder in the council.
Here, 'äldste' functions as a superlative adjective used to describe the member with the longest membership duration or highest age.