This is the 5418th most frequent Russian word.
пенсионеров
"Pensioners" or "retirees."
The word 'пенсионеров' is in the genitive plural form and is used here to indicate 'among retirees'.
Это место популярно у пенсионеров.
This place is popular among retirees.
Here, 'пенсионеров' is in the accusative plural form and is used as a direct object.
Мы встретили группу пенсионеров в парке.
We met a group of retirees in the park.
In this sentence, 'пенсионеров' is in the genitive plural form, used to show possession or relation ('issues of retirees').