This is the 15530th most frequent Polish word.
starsi
"Elders" or "older people."
Here, 'starsi' is used as an adjective that describes the noun 'ludzie' (people), referring to their advanced age.
Starsi ludzie często potrzebują większego wsparcia.
Older people often need more support.
In this sentence, 'starszych' is the plural masculine form used as an adjective modifying 'kuzynów' (cousins), indicating that they are older.
Mam starszych kuzynów, którzy mieszkają za granicą.
I have older cousins who live abroad.
Here, 'starsi' is used as a noun derived from the adjective, referring to the group of older students explicitly.