In chapter 7 when they were together, Ayoung and Soojin said how old they were (6 and 10), but Minah did not. In chapter 14 Minah states that she's been in High School for a year, so she's probably at least 16, if not 17 years old so, in Japan, she wouldn't necessarily be considered jail bait. Minsok's (and the old lady's) age has not been revealed. I'd guess he's around 24 (I won't guess how old she is or if she really has a husband). Neither has Ellie's age been stated, though she's at Uni, and Dahee (the drunken arm-wrestler) is in her 30s.