Zhè wèi lǎo qiánbèi zài yìjiè gēngyún le wǔshí nián.
This veteran has worked in the arts world for fifty years.
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艺界 is a fairly literary or journalistic term, more or less synonymous with 艺术界 (yìshùjiè). It groups visual arts, performance, music, and entertainment together.
memory
艺 (art) + 界 (realm/world) — same 界 suffix as 商界 (business world), 学界 (academic world), 政界 (political world).