I'm either 27 or 28 in Korean age, depending if the person calculates according to the Solar or Lunar calender. Whenever someone asks my age, I just tell them that I'm 빠른 팔팔 (a fast '88), which means that I was born in 1988 before the Lunar New Year. Usually, if I meet people born in 1987, they'll quickly ask if they can talk to me more casually since we're technically in the same age group, and if I meet someone born in 1988 after the Lunar New Year, they'll talk to me with more respect.