Guys, GUYS! Furuta is born in a leap year, right??? So I checked the leap years in the last few years:

1988
1992
1996
2000
2004
2008
2012
2016

So let’s say the story is currently set in 2016 and as we found out, Furuta just turned 24. That would mean he was born in 1992. And in that case:

  • 1984 ‒ Arima (32)
  • 1985
  • 1986 ‒ Amon (30)
  • 1987
  • 1988 ‒ Koori (listed as 27-28??)
  • 1989 ‒ Eto (27), Koori (listed as 27-28??)
  • 1990
  • 1991 ‒ Seidou, Akira, Tsukiyama, Hori (all of them are 25)
  • 1992 ‒ Furuta (24)
  • 1993 ‒ Kaneki, Suzuya, Rize, Hide (they’re 23)
  • 1994 
  • 1995 ‒ Touka, Saiko (both are 21)
  • 1996 ‒ Mutsuki, Urie, Shirazu (all are 20)
  • 1997 ‒ Karren (19), Ayato (listed as 18-19 in the wikia???)
  • 1998 ‒ Ayato (listed as 18-19 in the wikia???)
  • 1999 ‒ Hinami (17)

Correct me if I’m wrong????