This is the 11967th most frequent Korean word.
노인들이
"노인들이" means "elderly people" or "seniors" in English.
노인들이 is used as the subject of the sentence, indicating 'the seniors' who are performing the action of exercising.
노인들이 공원에서 체조를 하고 있다.
The seniors are exercising in the park.
노인들이 here emphasizes the group of elders in the village and their reciprocal caring action.
그 마을에서는 노인들이 서로를 잘 돌본다.
In that village, the seniors take good care of each other.
노인들이 signifies the increasing population of seniors, introducing a cause-effect relationship in the sentence.