Stärající
Stärající is not a widely recognized term in standard dictionaries of Czech, Swedish, or other languages. It appears to be a nonstandard form or a possible misspelling of a related Czech word, most plausibly stárající, which comes from the verb stárnout meaning to age.
If interpreted as Czech, stárající would function as a present participle adjective describing someone or something
Etymology and morphology: stárnout is the verb meaning to age. The present participle forms include stárnoucí
Usage and contexts: In demography, sociology, and public policy, phrases with stárnoucí or stárající are common