A person sits at the National Health Insurance Service office in Jongno District in central Seoul in 2024. [YONHAP]

Nearly 1 million adults aged 26 to 50 are still registered as dependents on a parent's health insurance, a measure of how many grown children in Korea remain financially tethered to their parents.

As of the end of last year, 942,718 people in that age range were covered as dependents on a parent's workplace health plan, the National Health Insurance Service (NHIS) said Thursday. Those people make up 6.1 percent of all 15,383,177 dependents.

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The numbers point to a growing group of what are known as "kangaroos," adults who lean on their parents well into middle age, as a tight job market and long spells of unemployment keep them from standing on their own.