South Korea’s current men’s national team coach, Hong Myung-bo, is 56 years old. He was born on February 12, 1969, so as of June 29, 2026, he is 57 if you count by birthday year, but still 56 until his next birthday.

If you meant a different South Korean soccer coach, the name would need to be specified, since “the South Korean soccer coach” can refer to different teams or levels.